TIRES

Abstract

A tire comprising:a tire component comprising a steel cord coated with a steel cord cap rubber composition; and an inner liner, wherein the tire component has a ratio of S to K (S / K) of 70 × 10-11 or higher, where S denotes a cord surface area S [mm2] defined by Expression (1) below, and K denotes an air permeability coefficient K [cc cm / cm2 sec cmHg] at 40 °C of the inner liner, Expression (1): Cord surface area S [mm2] = Diameter [mm] of single cord × π × Number of twisted cords × Number of twisted cords per meter of tire component in the tire width direction × 1 [mm], wherein the steel cord cap rubber composition comprises at least one selected from the group consisting of compounds represented by the following formula (2) and compounds represented by the following formula (3): where A is a C2-C4 alkylene group,represents a phenylene group or a divalent C6-C29 hydrocarbon group having one to four aromatic rings, and R11 to R14 each independently represent a hydrogen atom, a C1-C5 alkyl group, an -NH2 group, or an -NO2 group; wherein R21 represents a saturated aliphatic hydrocarbon group, an aromatic hydrocarbon group, or a group consisting of a combination of two or more of these groups, R22 and R23 are the same or different and each independently represents a C1-C10 hydrocarbon group optionally having a substituent, n each independently represents an integer from 0 to 4, plural R22s may be the same or different from each other, and plural R23s may be the same or different from each other.

Description

TECHNICAL FIELDThe present invention relates to a tire.PRIOR ARTSteel cord cover rubber compositions in tires contain materials for securing adhesion between steel cords and rubber, particularly adhesion performance under deterioration by heat and moisture, such as cobalt compounds, resorcinol-formaldehyde resin and phenol resin.SUMMARY OF THE INVENTIONTECHNICAL PROBLEMUnfortunately, cobalt compounds may not meet environmental regulations in Europe and are difficult to obtain because they are produced primarily in the Democratian Republic Congo. In addition, resorcinolic compounds can also violate environmental regulations. Further, both phenol resin and resorcinol-formaldehyde resin release water by dehydrogenation condensation upon polymerization during vulcanization, potentially reducing adhesion performance with deterioration by heat and moisture.The present invention aims to solve the problem and provide a tire having excellent adhesion performance even after degradation by heat and moisture.SOLUTION TO PROBLEMThe present invention relates to a tire comprising:a tire component including a steel cord coated with a steel cord cover rubber composition; andan inner liner,wherein the tire component has a ratio of S to K (S / K) of 70×10 -11 or higher, wherein S denotes a cord surface area S [mm 2] defined by Expression (1) below, and K denotes an air permeability coefficient K [cc.cm / cm 2 · sec·cmHg] at 40° C. of the inner liner,Expression (1):A cord surface area S [mm 2] = diameter [mm] of single cord × π × number of twisted cords × number of twisted cords per meter of tire component in the tire width direction × 1 [mm], wherein the steel cord covering rubber composition contains at least one selected from the group consisting of compounds represented by the following formula (2) and compounds represented by the following formula (3): wherein A represents a C2-C4 alkylene group, a phenylene group or a C6-C29 divalent hydrocarbon group having one to four aromatic rings, and R 11 to R 14 each independently represent a hydrogen atom, a C1-C5 alkyl group, a -NH 2- group or a -NO 2- group; wherein R 21 represents a saturated aliphatic hydrocarbon group, an aromatic hydrocarbon group or a group consisting of a combination of two or more of these groups, R 22 and R 23 are the same or different and each independently represent a C1-C10 hydrocarbon group optionally having a substituent, n each independently represents an integer of 0 to 4, a plurality of R 22 may be the same or different, and a plurality of R 23 may be the same or different.In the unit [cc·cm / cm 2 ·sec·cmHg] for the air permeability coefficient K, "cc" stands for "standard cubic centre", and denotes the amount of substance contained in one cubic centimeter under standard conditions (0° C., 10 5 Pa).ADVANTAGEOUS EFFECTS OF THE INVENTIONThe tire of the present invention comprises a tire component containing a steel wire coated with a steel cord cover rubber composition and an inner liner, the tire component having a ratio of S to K (S / K) of 70×10 -11 or higher, wherein S denotes a cord surface area S [mm 2] defined by Expression (1), and K denotes an air permeability coefficient K [cc·cm / cm 2 ·sec-cmHg] at 40° C. of the inner liner, the steel cord cover rubber composition containing at least one selected from the group consisting of compounds represented by Formula (2) and compounds represented by Formula (3). Thus, the present invention can provide a tire having excellent adhesion performance even after deterioration by heat and moisture.BRIEF DESCRIPTION OF THE DRAWINGSFig. 1 is a meridional cross-sectional view of a tire according to the present invention. FIG. 2 is an enlarged cross-sectional view of a belt layer and a band layer in the tire in FIG. 1. FIG. 3 is an enlarged cross-sectional view showing a tread portion and its vicinity in FIG. 1.DESCRIPTION OF EMBODIMENTSThe present invention relates to a tire comprising a tire component containing a steel cord coated with a steel cord cover rubber composition and an inner liner. The tire component has a ratio of S to K (S / K) of 70×10 -11 or higher, where S denotes a cord surface area S [mm 2] defined by Expression (1), and K denotes an air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] at 40° C. of the inner liner. The steel cord covering rubber composition contains at least one selected from the group consisting of compounds represented by formula (2) and compounds represented by formula (3).The reason for the advantageous effect of the tire described above is not exactly clear, but it is presumably as follows.The use of the compounds represented by formulae (2) and (3) suppresses the release of water upon polymerization during vulcanization. Thus, adhesion performance can be reliably obtained even with deterioration by heat and moisture.Moreover, the ensured cord contact area defined by Expression (1) can improve adhesion force and also reduce entry of moisture from an inner surface of the tire. Further, a ratio (S / K) of the cord surface area to the air permeability coefficient of the inner liner disposed on the inner surface of the tire is controlled to be 70×10 -11 or higher, whereby the adhesive force between the steel cord and rubber can be improved even under deterioration by heat and moisture.Accordingly, the present invention can provide a tire having excellent adhesion performance even after deterioration by heat and moisture.As described above, the present invention solves the problem (object) of improving the adhesion performance after deterioration by heat and moisture by providing a tire having the structure satisfying "the ratio S / K of 70×10 -11 or higher". In other words, the parameter of "the ratio S / K of 70×10 -11 or higher" does not define the problem (target). The problem here is to improve adhesion performance after deterioration by heat and moisture. To solve the problem, the tire was configured to satisfy the parameter.In the tire of the present invention, a ratio S / K of the cord surface area S [mm 2], which is defined by Expression (1) below, of the steel cord in the tire component to the air permeability coefficient K [cc·cm / cm 2 ·sec-cmHg] at 40° C. of the inner liner is 70×10 -11 or higher.The ratio S / K is preferably 75×10 -11 or higher, more preferably 80×10 -11 or higher, even more preferably 85×10 -11 or higher, even more preferably 101×10 -11 or higher, even more preferably 113×10 -11 or higher, even more preferably 132×10 -11 or higher, even more preferably 134×10 -11 or higher, even more preferably 151×10 -11 or higher, even more preferably 201×10 -11 or higher, even more preferably 302×10 -11 or higher, even more preferably 402×10-11or higher, and even more preferably 603×10-11or higher. The upper limit of the ratio S / K is not limited, and is preferably 1000×10 -11 or lower, more preferably 900×10 -11 or lower, even more preferably 850×10 -11 or lower, even more preferably 750×10 -11 or lower, and even more preferably 650×10 -11 or lower. When the ratio S / K is within the above-mentioned range, the advantageous effect tends to be better obtained.The tire component has a cord surface area S of preferably 1000 mm 2 or more, more preferably 1100 mm 2 or more, even more preferably 1131 mm 2 or more, even more preferably 1200 mm 2 or more, even more preferably 1319 mm 2 or more, even more preferably 1508 mm 2 or more, even more preferably 2011 mm 2 or more, and even more preferably 6032 mm 2 or more. The upper limit of the cord surface area S is not limited, and is preferably 10000 mm 2 or less, more preferably 9000 mm 2 or less, and even more preferably 7000 mm 2 or less. When the cord surface area S is within the above-mentioned range, the advantageous effect tends to be better obtained.The mechanism by which the advantageous effect can be better obtained by controlling the cord surface area S to be not less than the predetermined value is not clear, but it is considered that the ensured cord contact area improves adhesive force, whereby the adhesive force between the steel cord and rubber can be improved even with deterioration by heat and moisture. Thus, adhesion performance is likely to be improved even after deterioration by heat and moisture.With respect to the steel cord in the tire component, the diameter of the single cord (steel wire diameter) is preferably 0.10 mm or more, more preferably 0.13 mm or more, still more preferably 0.15 mm or more, still more preferably 0.20 mm or more, still more preferably 0.30 mm or more, and still more preferably 0.40 mm or more, while being preferably 0.60 mm or less, still more preferably 0.50 mm or less, and still more preferably 0.45 mm or less. When the diameter of the single cord is within the above-mentioned range, the advantageous effect tends to be better obtained.With respect to the steel cord in the tire component, the number of twisted cords is preferably one or more, more preferably two or more, and still more preferably four or more, while it is preferably 30 or less, more preferably 20 or less, still more preferably 10 or less, and still more preferably six or less. When the number of twisted cords is within the above-mentioned range, the advantageous effect tends to be better obtained.In the steel cord in the tire component, the number of twisted cords per meter of the tire component in a tire width direction is preferably 200 / m or more, more preferably 300 / m or more, still more preferably 400 / m or more, still more preferably 500 / m or more, still more preferably 600 / m or more, still more preferably 700 / m or more, still more preferably 800 / m or more, and still more preferably 1200 / m or more, while being preferably 2000 / m or less, still more preferably 1500 / m or less, and still more preferably 1300 / m or less. When the number of twisted cords per meter of the tire component in the tire width direction is within the above-mentioned range, the advantageous effect tends to be better obtained.The inner liner (rubber composition for inner liner) has an air permeability coefficient K [cc·cm / cm 2 ·sec-cmHg] of preferably 25×10 -11 or less, more preferably 15×10 -11 or less, even more preferably 12×10 -11 or less, and even more preferably 10×10 -11 or less. The lower limit of the air permeability coefficient K is not limited, and is preferably 1×10 -11 or more, more preferably 3×10 -11 or more, and even more preferably 5×10 -11 or more. When the air permeability coefficient K is within the above range, the advantageous effect tends to be better obtained.The mechanism by which the advantageous effect can be better obtained by controlling the cord surface area S to be not less than the predetermined value is not clear, but it is considered that the controlled cord surface area S can further reduce entry of moisture from the inner surface of the tire. Thus, adhesion performance is likely to be improved even after deterioration by heat and moisture.Here, the term "diameter of single cord" refers to the outer diameter of a single cord (single filament) measured in a cross section perpendicular to a longitudinal direction of the single cord. When the outer diameter is difficult to clearly determine, such as in a case of a single cord having a flat shape or the like in a cross section perpendicular to a longitudinal direction of the single cord, an average of the major diameter and the largest diameter perpendicular to the major diameter of the single thread is adopted as the outer diameter of the single cord (diameter of single cord).Here, "π" refers to the number Pi.The term "number of twisted cords" refers to the number of single cords (single filaments) in a cord consisting of one or more single cords (single filaments) twisted together. The number of twisted cords of a cord consisting of a single cord is one, while the number of twisted cords of a cord consisting of two single cords twisted together is two.The term "number of twisted cords per meter of tire component in the tire width direction" refers to the number of twisted cords (final number) per meter of the tire component in the tire width direction.Specifically, in the case where the diameter of the single cord (diameter of single filament) is 0.30 mm, the number of twisted cords (the number of single filaments) is two, and the number of twisted cords per meter of the tire component in the tire width direction is 600, which is the same as the number of twisted cords per meter of the tire component in the tire width direction.Here, the "diameter of single cord" is determined by measuring the diameter of a cord material observed under an optical microscope.The "number of twisted cords" is determined by counting the number of cords of the cord material observed under an optical microscope.The "number of twisted cords per meter of tire component in the tire width direction" is determined by measuring the number of cords of the cord material embedded in the tire and the length of the tire component, and then the measured number is converted into the number per meter of the tire component.The cord surface area S can be controlled by appropriately selecting the diameter of the single cord, the number of twisted cords, or the number of twisted cords per meter of the tire component in the tire width direction. Specifically, the cord surface area S tends to be increased by a smaller diameter of the single cord, a larger number of twisted cords, or a larger number of twisted cords per meter of the tire component in the tire width direction.Here, the term "air permeability coefficient" refers to a value measured in accordance with JIS K 7126-1:2006. Specifically, the air permeability coefficient is measured by the method described in EXAMPLES later.The air permeability coefficient is the value of a vulcanized rubber composition (a rubber composition after vulcanization).The air permeability coefficient K at 40° C. can be controlled by changing the types or amounts of the rubber component, fillers, or plasticizers. Specifically, the air permeability coefficient K tends to be reduced by using a predetermined amount or more of butyl-based rubbers or by increasing the predetermined amount of fillers.The steel cord is a steel cord made of a plurality of brass-plated steel wires twisted together or a steel cord made of a single steel wire. The steel wire is a linear metal mainly made of steel, i.e., iron (iron mass exceeds 50% by mass relative to the total mass of the metal steel wire). The metal may contain metals other than iron.Non-limiting examples of a cross-sectional shape of the steel wire perpendicular to an axis of the steel wire include circular, elliptical, rectangular, triangular, and polygonal shapes. Among them, a circular shape is desirable.When the steel cord used in a carcass or a belt layer is a reinforced metal cord composed of the steel wires twisted together, the steel wire preferably has a circular cross-sectional shape.The steel wire preferably has a brass plating layer having the above-described composition on its surface. The thickness of the plating layer is not limited, and is generally 100 to 300 nm, for example.A metal cord formed of a steel cord can be obtained, for example, by conventional methods by twisting a plurality of metal wires (e.g., steel wires) with brass plating applied therearound into a 1×3 structure, a 1×25 structure, or the like.The steel cord is preferably a belt cord or a carcass cord for tires.The tire of the present invention comprises a tire component containing a steel cord coated with a steel cord cover rubber composition and an inner liner.The tire component may be any tire component including a steel cord. In order to better achieve the advantageous effect, the tire component is preferably a carcass or a belt layer. The steel cord cover rubber composition corresponds to a steel cord cover carcass rubber composition at a carcass or a steel cord cover belt layer rubber composition at a belt layer. The belt layer may include one reinforcing layer or two or more reinforcing layers. When the tire component is a belt layer, at least one reinforcing layer in the belt layer contains a steel cord coated with the steel cord cover rubber composition.The mechanism by which the advantageous effect can be more effectively obtained when the tire component is a carcass or a belt layer is not clear, but it is considered that the ratio S / K controlled to be 70×10 -11 or higher can secure the cord contact area in the carcass or the belt layer to improve adhesion force, whereby the adhesion force between the steel cord and rubber can be improved even under deterioration by heat and moisture. Thus, adhesion performance is likely to be improved even after deterioration by heat and moisture.The inner liner contains an inner liner rubber composition.The steel cord covering rubber composition in the tire contains at least one selected from the group consisting of compounds represented by the following formula (2) and compounds represented by the following formula (3): wherein A represents a C2-C4alkylene group, a phenylene group or a C6-C29divalent hydrocarbon group having one to four aromatic rings, and R 11 to R 14 each independently represent a hydrogen atom, a C1-C5alkyl group, a -NH 2- group or a -NO 2- group; wherein R 21 represents a saturated aliphatic hydrocarbon group, an aromatic hydrocarbon group, or a group consisting of a combination of two or more of these groups, R 22 and R 23 are the same or different and each independently represent a C1-C10hydrocarbon group optionally having a substituent, n each independently represents an integer of 0 to 4, a plurality of R 22 may be the same or different, and a plurality of R 23 may be the same or different.Examples of the alkylene group C2-C4as A in formula (2) include an ethylene group, a propylene group, and a propane-2,2-diyl group.The number of aromatic rings in the C6-C29divalent hydrocarbon group having one to four aromatic rings is preferably one or two. Specific examples of the C6-C29divalent hydrocarbon group having one to four aromatic rings include a methylenebis(phenylene) group, a phenylenebis(methylene) group, and a phenoxyphenyl group. The aromatic ring may be bonded through -O-, -S-, -SS-, -SO 2 or the like.A is preferably a phenylene group or a C8-C17hydrocarbon group having one or two aromatic rings, and more preferably a phenylene group or a C8-C13hydrocarbon group having one or two aromatic rings.A may have a substituent. Examples of the substituent include a C1-C3alkyl group, -NH 2, - NO 2, - F, -Cl and -Br.Examples of the C1-C5alkyl group as any one of R 11 to R 14 in formula (2) include a methyl group, an ethyl group, and a propyl group. In particular, R 11 to R 14 preferably each represent a hydrogen atom.Specific examples of the compounds represented by formula (2) include 4,4'-diphenylmethane bismaleimide, m-phenylene bismaleimide, N,N'-1,2-ethylene bismaleimide, N,N'-1,2-propylene bismaleimide, bis(3-ethyl-5-methyl-4-maleimidophenyl)methane, 2,2'-bis[4-(4-maleimidophenoxy)phenyl]propane, m-phenylenebis(methylene)bismaleimide, m-phenylenebis(methylene)biscitraconimide, and 1,1'-(methylenedi-4,1-phenylene)bismaleimide. These may be used alone or in combinations of two or more.In order to more effectively achieve the advantageous effect, 4,4'-diphenylmethane bismaleimide and m-phenylene bismaleimide are preferred, and 4,4'-diphenylmethane bismaleimide is more preferred among them.The amount of the compounds represented by formula (2) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 0.1 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 2.0 parts by mass or more, while being preferably 5.0 parts by mass or less, more preferably 4.0 parts by mass or less, and even more preferably 3.5 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.Specific examples of the saturated aliphatic hydrocarbon group as R 21 in formula (3) include a methylene group, an ethylene group, a trimethylene group, a tetramethylene group, a propylene group, and an isopropylene group.Specific examples of the aromatic hydrocarbon group as R 21 include a phenyl group and a naphthyl group. Among these, a phenyl group is preferred.Examples of R 21 include these saturated aliphatic hydrocarbon groups and groups each consisting of a combination of two or more of these aromatic hydrocarbon groups.The C1-C10hydrocarbon group as R 22 or R 23 in formula (3) is not limited. The hydrocarbon group may have a substituent.Examples of the C1-C10hydrocarbon group include chain alkyl groups which may be branched, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a t-butyl group, a pentyl group, a hexyl group, an octyl group, and a decyl group; alicyclic hydrocarbon groups, such as a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, and a cyclohexenyl group; aryl substituted alkyl groups, such as a benzyl group and a phenethyl group; alkoxy substituted alkyl groups, such as methoxy substituted alkyl groups, ethoxy substituted alkyl groups, and butoxy substituted alkyl groups; alkenyl groups, such as a vinyl group, an allyl group, and a butenyl group; aryl groups, such as a phenyl group and a naphthyl group; alkyl-substituted aryl groups such as a tolyl group, a dimethylphenyl group, an ethylphenyl group, a butylphenyl group and a t-butylphenyl group; and alkoxy-substituted aryl groups such as a methoxyphenyl group, an ethoxyphenyl group, a butoxyphenyl group and a t-butoxyphenyl group.Examples of substituents which may be present in the C1-C10hydrocarbon group optionally having a substituent include alkoxy groups such as a methoxy group, an ethoxy group, and a butoxy group; alkenyl groups such as a vinyl group, an allyl group, and a butenyl group; aryl groups such as a phenyl group, a naphthyl group, and a biphenyl group; alkyl groups such as a methyl group, an ethyl group, a butyl group, and a t-butyl group; an ether bond, and an ester bond.In formula (3), n represents each independently an integer of 0 to 4, and is preferably 0, 1 or 2, and more preferably 0.In order to more effectively achieve the advantageous effect, the compounds represented by formula (3), for example, compounds represented by the following formula (3-1) are desirable: wherein R 31 to R 34 are the same or different and each independently represent a C1-C10hydrocarbon group optionally having a substituent, n each independently represents an integer of 0 to 4, and a plurality of R 31, a plurality of R 32, a plurality of R 33 or a plurality of R 34 may be the same or different from each other.The C1-C10hydrocarbon group as any one of R 31 to R 34 in formula (3-1) is not limited. The hydrocarbon group may have a substituent.Examples of the C1-C10hydrocarbon group include those described for the C1-C10hydrocarbon group as R 22 or R 23.Examples of substituents which may be present in the C1-C10hydrocarbon group include the optional substituents described above in the C1-C10hydrocarbon group.In formula (3-1), n each independently represents an integer of 0 to 4, and is preferably 0, 1, or 2, and more preferably 0.In order to more effectively achieve the advantageous effect, among the compounds represented by formula (3), compounds represented by the following formula (3-2) are particularly preferred. Examples of commercially available compounds represented by formula (3-2) include benzoxazine P-d (trade name benzoxazine P-d, Shikoku Chemicals Corporation).The amount of the compounds represented by formula (3) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 0.1 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 2.0 parts by mass or more, while being preferably 5.0 parts by mass or less, more preferably 4.0 parts by mass or less, and even more preferably 3.5 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of the compounds represented by formula (3-1) and the amount of the compounds represented by formula (3-2) are also preferably within the above-mentioned range.Chemicals usable in the steel cord cover rubber composition and / or the inner liner rubber composition except for the compounds represented by formula (2) and the compounds represented by formula (3) will be described below. The chemicals are commonly usable in the steel cord cover rubber composition and the inner liner rubber composition.The steel cord covering rubber composition and the inner liner rubber composition contain a rubber component.The rubber component contributes to crosslinking and generally corresponds to a polymer component which has a weight average molecular weight (Mw) of 10000 or more and which is not extractable with acetone. The rubber component is solid at room temperature (25° C.).The weight average molecular weight of the rubber component is preferably 50000 or more, more preferably 150000 or more, still more preferably 200000 or more, and further preferably 270000 or more, while it is preferably 2000000 or less, further preferably 1500000 or less, and still further preferably 1000000 or less. When the weight average molecular weight is within the above range, the advantageous effect tends to be better obtained.Here, the weight average molecular weight (Mw) and the number average molecular weight (Mn) can be determined by gel permeation chromatography (GPC) (GPC-8000 series available from Tosoh Corporation, detector: differential refractometer, column: TSKgel SuperMultipore HZ-M available from Tosoh Corporation), and calibrated with polystyrene standards.The rubber component usable in the steel cord cover rubber composition and / or the inner liner rubber composition may be either unmodified or modified rubbers.The modified rubbers may be rubbers having a functional group interacting with a filler such as silica. Examples include a chain-end-modified rubber obtained by modifying at least one chain end of a rubber with a compound (modifier) having the above functional group (i.e., a chain-end-modified rubber ending with the functional group); a main chain-modified rubber having the functional group in the main chain; a main chain- and chain-end-modified rubber having the functional group in both the main chain and a chain end (e.g., a main chain- and chain-end-modified rubber in which the main chain has the functional group and at least one chain end is modified with the modifier); and a chain-end-modified rubber in which a hydroxy or epoxy group has been introduced by modification (coupling) with a polyfunctional compound having two or more epoxy groups in the molecule.Examples of the functional group include amino, amide, silyl, alkoxysilyl, isocyanate, imino, imidazole, urea, ether, carbonyl, oxycarbonyl, mercapto, sulfide, disulfide, sulfonyl, sulfinyl, thiocarbonyl, ammonium, imide, hydrazo, azo, diazo, carboxyl, nitrile, pyridyl, alkoxy, hydroxy, oxy and epoxy groups. These functional groups may be substituted. Among these, amino groups (preferably amino groups whose hydrogen atom is replaced by a C1-C6alkyl group), alkoxy groups (preferably C1-C6alkoxy groups), and alkoxysilyl groups (preferably C1-C6alkoxysilyl groups) are preferred.Non-limiting examples of the rubber component include diene-based rubbers. Examples of diene-based rubbers include isoprene-based rubbers, polybutadiene rubber (BR), styrene-butadiene rubber (SBR), styrene-isoprene-butadiene rubber (SIBR), ethylene-propylene-diene rubber (EPDM), chloroprene rubber (CR), and acrylonitrile-butadiene rubber (NBR). Examples of the rubber component also include butyl-based rubbers and fluororubbers. These may be used alone or in combinations of two or more. Modified or hydrogenated products of these rubbers are also usable. Rubbers extended with oils, resins, liquid rubber components, etc. are also usable.The steel cord covering rubber composition preferably contains at least one isoprene-based rubber, BR and SBR, and more preferably contains at least one isoprene-based rubber.The inner liner rubber composition preferably contains at least one butyl-based rubber and an isoprene-based rubber, and more preferably contains at least one butyl-based rubber.Examples of isoprene-based rubbers include natural rubbers (NR), polyisoprene rubbers (IR), refined NR, modified NR and modified IR. Examples of NR include those commonly used in the rubber industry, such as SIR20, RSS#3 and TSR20. Any IR may be used, including those commonly used in the rubber industry, such as IR2200. Examples of refined NR include deproteinized natural rubbers (DPNR) and high purity natural rubbers. Examples of modified NR include epoxidized natural rubbers (ENR), hydrogenated natural rubbers (HNR), and grafted natural rubbers. Examples of modified IR include epoxidized polyisoprene rubbers, hydrogenated polyisoprene rubbers, and grafted polyisoprene rubbers. These may be used alone or in combinations of two or more.Examples of butyl-based rubbers include butyl rubber and halogenated butyl rubbers such as chlorinated butyl rubber (Cl-IIR), brominated butyl rubber (Br-IIR), and fluorinated butyl rubber (F-IIR). Examples of commercially available butyl-based rubbers include Exxpro and chlorobutyl HT1068 available from ExxonMobil. These may be used alone or in combinations of two or more. It is desirable to include halogenated butyl rubber.Any BR can be used, and examples include high cis BR having a high cis content, BR containing syndiotactic polybutadiene crystals, and BR synthesized using rare earth catalysts (rare earth catalyzed BR). These may be used alone or in combinations of two or more. In particular, the BR preferably contains high cis BR having a cis content of 90% by mass or higher. The cis content is more preferably 95 mass % or higher. Here, the cis content can be measured by infrared absorption spectrometry.When one type of BR is used, the cis content of the BR refers to the cis content of the one BR, while when several types of BR are used, it refers to the average cis content.The average cis content of the BR can be calculated using the equation: {Σ (amount of each BR× cis content of each BR)} / amount of total BR. When 100 mass % of rubber components contain 20 mass % of BR having a cis content of 90 mass % and 10 mass % of BR having a cis content of 40 mass %, the average cis content of the BR is 73.3 mass % (=(20×100×40) / (20+10)), for example.The BR may be either unmodified or modified BR. Examples of the modified BR include those into which the functional groups listed for the modified rubbers have been introduced. The BR may also be hydrogenated polybutadiene polymers (hydrogenated BR).Any SBR may be used. Examples include emulsion polymerized styrene-butadiene rubbers (E-SBR) and solution polymerized styrene-butadiene rubbers (S-SBR). These may be used alone or in combinations of two or more.The styrene content of the SBR is preferably 5 mass % or higher, more preferably 20 mass % or higher, and even more preferably 25 mass % or higher. The styrene content is preferably 60 mass % or lower, more preferably 40 mass % or lower, and even more preferably 35 mass % or lower. When the styrene content is within the above-mentioned range, the advantageous effect tends to be better obtained.Here, the styrene content can be measured by 1 H-NMR analysis.When one type of SBR is used, the styrene content of the SBR refers to the styrene content of the one SBR, while when multiple types of SBR are used, it refers to the average styrene content.The average styrene content of the SBR can be calculated using the equation: {Σ (amount of each SBR×styrene content of each SBR)} / amount of total SBR. For example, when 100 mass % of rubber components contain 85 mass % of SBR having a styrene content of 40 mass % and 5 mass % of SBR having a styrene content of 25 mass %, the average styrene content of the SBR is 39.2 mass % (=(85×40+5×25) / (85+5)).The vinyl bond content of the SBR is preferably 30 mass % or higher, more preferably 40 mass % or higher, and even more preferably 50 mass % or higher. The vinyl bond content is preferably 70 mass % or lower, more preferably 65 mass % or lower, and most preferably 60 mass % or lower. When the vinyl bond content is within the above range, the advantageous effect tends to be better obtained.Here, the vinyl bond content (1,2-butadiene unit content) can be measured by infrared absorption spectrometry.The vinyl content (1,2-butadiene unit content) of the SBR refers to the vinyl bond content (unit: mass %) based on the total mass of the butadiene portion in the SBR, which is assumed to be 100. The sum of the vinyl content (mass %), the cis content (mass %), and the trans content (mass %) is 100 (mass %). When one type of SBR is used, the vinyl content of the SBR refers to the vinyl content of the one SBR, while when several types of SBR are used, it refers to the average vinyl content.The average vinyl content of the SBR can be calculated using the equation: Σ{amount of each SBR×(100 (mass %)-styrene content (mass %) of each SBR)×vinyl content (mass %) of each SBR} / Σ20 amount of each SBR×(100 (mass %)-styrene content (mass %) of each SBR)}. For example, when 100 parts by mass of rubber components contain 75 parts by mass of SBR having a styrene content of 40% by mass and a vinyl content of 30% by mass, 15 parts by mass of SBR having a styrene content of 25% by mass and a vinyl content of 20% by mass, and the remaining 10 parts by mass of a rubber component other than SBR, the average vinyl content of the SBR is 28% by mass (={75×(100 (% by mass) - 40 (% by mass))×30 (% by mass)+15×(100 (% by mass) - 25 (% by mass))×20 (% by mass)} / {75×(100 (% by mass) - 40 (% by mass)+15×(100 (% by mass) - 25 (% by mass)}.The SBR may be either unmodified or modified SBR. Examples of the modified SBR include those into which the functional groups listed for the modified rubbers have been introduced. The SBR may also be hydrogenated styrene-butadiene copolymers (hydrogenated SBR).The amount of isoprene-based rubbers based on 100% by mass of the rubber component in the steel cord cover rubber composition is preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, and may be 100% by mass. When the amount is within the above range, the advantageous effect tends to be better obtained.The mechanism by which the advantageous effect can be more effectively obtained by controlling the amount of isoprene-based rubbers to be a predetermined amount or more, particularly 90% by mass or more is not clear, but it is considered that the steel cord cover rubber composition containing a large amount of isoprene-based rubbers can have improved adhesion strength to the cord. Thus, adhesion performance is likely to be improved even after deterioration by heat and moisture.The amount of butyl-based rubbers based on 100% by mass of the rubber component in the inner liner rubber composition is preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 90% by mass or more. The upper limit is not limited and may be 100% by mass. For example, the amount may be 97% by mass or less, 95% by mass or less, or 85% by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of isoprene-based rubbers based on 100% by mass of the rubber component in the inner liner rubber composition is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 10% by mass or less. The lower limit is not limited and may be 0 mass %. For example, the amount may be 1 mass % or more, 5 mass % or more, or 7 mass % or more. When the amount is within the above range, the advantageous effect tends to be better obtained.The steel cord covering rubber composition and the inner liner rubber composition preferably contain a filler.Any filler may be used, including materials known in the rubber industry. Examples include inorganic fillers such as carbon black, silica, calcium carbonate, talc, alumina (alumina), clay, aluminum hydroxide, alumina and mica; biocarbon; and fillers difficult to disperse. Among these, in order to more effectively achieve the advantageous effect, carbon-derived fillers (carbonaceous fillers) such as carbon black and silica are preferred. One filler may be used alone, or two or more fillers may be used in combination.Non-limiting examples of carbon black that can be used in the steel cord cover rubber composition and / or the inner liner rubber composition include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, N660, and N762. Usable commercial products are available from Asahi Carbon Co., Ltd., Cabot Japan K.K., Tokai Carbon Co., Ltd., Mitsubishi Chemical Corporation, Lion Corporation, NSCC Carbon Co., Ltd., Columbia Carbon, etc. These may be used alone or in combinations of two or more. In addition to a conventional carbon black of mineral oils, etc., carbon black of biomass materials such as lignin is also usable. Examples of usable carbon black also include recycled carbon black obtained by decomposing carbon black-containing products such as rubber products (e.g., tires) and plastic products, thermally decomposing carbon black and recovered carbon black.A statistical thickness surface area (STSA) of the carbon black is preferably 20 m 2 / g or more, more preferably 25 m 2 / g or more, still more preferably 30 m 2 / g or more, and still more preferably 36 m 2 / g or more. The STSA is preferably 150 m 2 / g or less, more preferably 130 m 2 / g or less, even more preferably 120 m 2 / g or less, more preferably 100 m 2 / g or less, and more preferably 84 m 2 / g or less. When the STSA is within the above range, the advantageous effect tends to be better obtained.Here, the STSA of the carbon black can be determined in accordance with JIS K 6217-2:2001.A nitrogen adsorption specific surface area (N 2 SA) of the carbon black is preferably in the above-described range for the STSA. The nitrogen adsorption specific surface area (N 2 SA) of the carbon black can be determined in accordance with JIS K 6217-2:2001.The carbon black has a dibutyl phthalate oil absorption (DBP oil absorption) of preferably 40 ml / 100 g or more, more preferably 60 ml / 100 g or more, and even more preferably 70 ml / 100 g or more. The DBP is preferably 200 ml / 100 g or less, more preferably 180 ml / 100 g or less, and still more preferably 150 ml / 100 g or less. When the DBP oil absorption is within the above range, the advantageous effect tends to be better obtained.The DBP of the carbon black can be determined in accordance with JIS K 6217-4:2001.Examples of silica usable in the steel cord cover rubber composition and / or the inner liner rubber composition include dry silica (anhydrous silica) and wet silica (hydrous silica). Among these, wet silica is preferred because it contains a large number of silanol groups. Useful commercial products are available from Degussa, Rhodia, Tosoh Silica Corporation, Solvay Japan, Tokuyama Corporation, etc. These may be used alone or in combinations of two or more.A silica of vegetable origin is suitably usable as the silica.Examples of silica of plant origin include silica derived from silica-containing plants. Examples of the silica-containing plants include rice, corn, sugarcane, horsetail, wheat, barley, rye, hiobstrane, millet, crabgrass, perlgrass, silver hairgrass and erianthus. Saccharification residues of the silica-containing plants are also useful. Rice hulls and high silica rice straw are preferred, with rice hulls being more preferred among them. The silica-containing plants may be ashes obtained by burning the plants or carbonized products of the plants.A nitrogen adsorption specific surface area (N 2 SA) of the silica is preferably 50 m 2 / g or more, more preferably 100 m 2 / g or more, and even more preferably 150 m 2 / g or more. The upper limit of the N 2 SA of the silica is not limited, and is preferably 350 m 2 / g or less, more preferably 300 m 2 / g or less, and even more preferably 250 m 2 / g or less. When the N 2 SA is within the above-mentioned range, the advantageous effect tends to be better obtained.Here, the N 2 SA of the silica is measured by a BET method in accordance with ASTM D3037-93.Examples of difficult-to-disperse fillers include microfibrillated plant fibers, short fiber celluloses, and gel compounds. Among these, microfibrillated plant fibers are preferred.Among the microfibrillated plant fibers, cellulose microfibrils are preferred for obtaining good reinforcement. Any cellulose microfibril derived from natural products can be used. Examples include those derived from biomass resources such as fruits, cereals and root vegetables; wood, bamboo, hemp, jute and kenaf; and pulp, paper or cloth produced therefrom; waste biomass such as agricultural wastes, food wastes and sewage sludge; unused biomass such as ripping raw, wheat straw and piercing woods; and celluloses produced from sea wastes, acetic acid bacteria or other organisms. These microfibrillated plant fibers can be used alone or in combinations of two or more.Here, the term "cellulose microfibrils" typically refers to cellulose fibers having an average fiber diameter of not more than 10 μm, more typically to cellulose fibers formed by aggregation of cellulose molecules having a microstructure having an average fiber diameter of not more than 500 nm. For example, typical cellulose microfibrils can be formed as aggregates of cellulose fibers having an average fiber diameter as indicated above.The amount of fillers (total amount of fillers such as carbon black and silica) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 30 parts by mass or more, more preferably 35 parts by mass or more, even more preferably 40 parts by mass or more, and even more preferably 50 parts by mass or more, while being preferably 100 parts by mass or less, more preferably 80 parts by mass or less, even more preferably 70 parts by mass or less, and even more preferably 60 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of carbon black per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 30 parts by mass or more, more preferably 35 parts by mass or more, still more preferably 40 parts by mass or more, and still more preferably 50 parts by mass or more, while being preferably 100 parts by mass or less, more preferably 80 parts by mass or less, still more preferably 70 parts by mass or less, and still more preferably 60 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of silica per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 30 parts by mass or less, more preferably 10 parts by mass or less, still more preferably 5 parts by mass or less, and may be 0 parts by mass. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of fillers (total amount of fillers such as carbon black and silica) per 100 parts by mass of the rubber component in the inner liner cover rubber composition is preferably 30 parts by mass or more, more preferably 40 parts by mass or more, even more preferably 50 parts by mass or more, and even more preferably 60 parts by mass or more, while being preferably 100 parts by mass or less, more preferably 80 parts by mass or less, and even more preferably 70 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of carbon black per 100 parts by mass of the rubber component in the inner liner rubber composition is preferably 30 parts by mass or more, more preferably 40 parts by mass or more, still more preferably 50 parts by mass or more, and still more preferably 60 parts by mass or more, while being preferably 100 parts by mass or less, more preferably 80 parts by mass or less, and still more preferably 70 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of silica per 100 parts by mass of the rubber component in the inner liner rubber composition is preferably 30 parts by mass or less, more preferably 10 parts by mass or less, still more preferably 5 parts by mass or less, and may be 0 parts by mass. When the amount is within the above range, the advantageous effect tends to be better obtained.The steel cord covering rubber composition and / or the inner liner rubber composition may further contain a silane coupling agent.Any silane coupling agent may be used and those known in the rubber industry are useful. Examples include sulfide silane coupling agents such as bis(3-triethoxysilylpropyl) tetrasulfide, bis(2-triethoxysilylethyl) tetrasulfide, bis(4-triethoxysilylbutyl) tetrasulfide, bis(3-trimethoxysilylpropyl) tetrasulfide, bis(2-trimethoxysilylethyl) tetrasulfide, bis(2-triethoxysilylethyl) trisulfide, bis(4-trimethoxysilylbutyl) trisulfide, bis(3-triethoxysilylpropyl) disulfide, bis(2-triethoxysilylethyl) disulfide, bis(4-triethoxysilylbutyl) disulfide, bis(3-trimethoxysilylpropyl) disulfide, bis(2-trimethoxysilylethyl) disulfide, bis(4-trimethoxysilylbutyl) disulfide, 3-trimethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 2-Triethoxysilylethyl-N,N-dimethylthiocarbamoyl tetrasulfide and 3-triethoxysilylpropyl methacrylate monosulfide; mercapto silane coupling agents such as 3-mercaptopropyltrimethoxysilane, 2-mercaptoethyltriethoxysilane and NXT and NXT-Z, both available from Momentive; vinyl silane coupling agents such as vinyltriethoxysilane and vinyltrimethoxysilane; amino silane coupling agents such as 3-aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane; glycidoxy silane coupling agents such as γ-glycidoxypropyltriethoxysilane and γ-glycidoxypropyltrimethoxysilane; nitro silane coupling agents such as 3-nitropropyltrimethoxysilane and 3-nitropropyltriethoxysilane; and chloro silane coupling agents such as 3-chloropropyltrimethoxysilane and 3-chloropropyltriethoxysilane. Useful commercial products are available from Degussa, Momentive, Shin-Etsu Silicone, Tokyo Chemical Industry Co., Ltd., AZmax Co., Dow Corning Toray Co., Ltd., etc. These may be used alone or in combinations of two or more.The amount of silane coupling agents per 100 parts by mass of the silica in the steel cord cover rubber composition and / or the inner liner rubber composition is preferably 0.1 parts by mass or more, more preferably 3 parts by mass or more, even more preferably 5 parts by mass or more, and even more preferably 7 parts by mass or more. The upper limit of the amount is preferably 50 parts by mass or less, more preferably 20 parts by mass or less, still more preferably 15 parts by mass or less, and further preferably 10 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The steel cord cover rubber composition and / or the inner liner rubber composition may contain a plasticizer.Here, the term "plasticizer" refers to a material that imparts plasticity to rubber components. It may be either liquid or solid at room temperature (25°C). The plasticizer may be used alone or in combinations of two or more.Examples of the plasticizer include oils, liquid polymers, and resins. These may be used alone or in combinations of two or more.Non-limiting examples of the oils include conventional oils including process oils such as paraffinic process oils, aromatic process oils and naphthenic process oils, low polycyclic aromatic process oils such as TDAE and MES, vegetable origin oils, and mixtures thereof. These may be used alone or in combinations of two or more. From the viewpoint of ecobalance, lubricating oils after they are used in mixers for mixing rubber, automobile engines, etc., or waste feed oils can be suitably used.Examples of the oils of vegetable origin (also referred to as vegetable oils) include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil, rosin, pine oil, pine tar, tall oil, corn oil, rice oil, safflower oil, sesame oil, olive oil, sunflower oil, palm kernel oil, camelial oil, jojoba oil, macadamia nut oil, and tung oil.Useful oils may be commercially available from Idemitsu Kosan Co., Ltd., Sankyo Yuka Kogyo K.K., ENEOS Corporation, Olisoy, H&R, Hokoku Corporation, Showa Shell Sekiyu K.K., Fuji Kosan Co., Ltd., Nisshin Oillio Group, etc.Examples of the liquid polymers include liquid diene polymers (liquid rubbers) and liquid farnesene polymers, all of which are liquid at 25° C. Examples of liquid rubbers include liquid styrene-butadiene copolymers (liquid SBR), liquid butadiene polymers (liquid BR), liquid isoprene polymers (liquid IR), liquid styrene-isoprene copolymers (liquid SIR), liquid styrene-butadiene-styrene block copolymers (liquid SBS block polymers) and liquid styrene-isoprene-styrene block copolymers (liquid SIS block polymers). The chain end or main chain thereof may be modified with a polar group. Hydrogenated products thereof are also usable.The weight average molecular weight (Mw) of the liquid diene-based polymers is preferably 1.0×10 3 to 5.0×10 4 and more preferably 3.0×10 3 to 1.5×10 4, as measured by gel permeation chromatography (GPC) and calibrated with polystyrene standards. The lower limit of the Mw of the liquid diene polymers may be 4500 or 8500, and the upper limit may be 4500 or 8500.Here, the Mw of the liquid diene polymers is measured by gel permeation chromatography (GPC) and calibrated with polystyrene standards.Useful liquid diene polymers may be commercially available from Sartomer, Kraton, etc.The resins may be resins conventionally used as additives for tires. They may be either liquid or solid at room temperature (25°C). Examples include aromatic vinyl polymers, coumarone-indene resins, coumarone resins, indene resins, phenol resins, rosin resins, petroleum resins, terpene resins and acrylic resins. The resins may be those hydrogenated (hydrogenated) resins. These may be used alone or in combinations of two or more. The resins themselves may be copolymers of different monomers. Among these, phenol resins are preferred.The softening point of the resins which are solid at room temperature, when used, is preferably 50° C. or higher, more preferably 55° C. or higher, even more preferably 60° C. or higher, and more preferably 85° C. or higher, while being preferably 160° C. or lower, more preferably 150° C. or lower, even more preferably 140° C. or lower, and more preferably 100° C. or lower. When the softening point is within the above-mentioned range, the advantageous effect tends to be better obtained.The softening point of the resins which are liquid at room temperature is preferably 20° C. or lower, 10° C. or lower, or 0° C. or lower.Hydrogenated resins preferably have a softening point within the above range.The softening point of the resins is determined in accordance with JIS K 6220-1:2001 using a ring-and-ball softening point measuring device. The temperature at which the ball falls is defined as the softening point.The vinyl aromatic polymers refer to polymers containing vinyl aromatic monomers as structural units. Examples include resins produced by polymerization of α-methylstyrene and / or styrene. Specific examples include styrene homopolymers (styrene resins), α-methylstyrene homopolymers (α-methylstyrene resins), copolymers of α-methylstyrene and styrene, and copolymers of styrene and other monomers.The coumarone-indene resins refer to resins containing coumarone and indene as the main monomer components constituting the skeleton (main chain) of the resins. Examples of monomer components that may be contained in the skeleton in addition to cumarone and indene include styrene, α-methylstyrene, methylindene, and vinyltoluene.The coumarone resins refer to resins containing coumarone as the main monomer component constituting the skeleton (main chain) of the resins.The indene resins refer to resins containing indene as the main monomer component constituting the skeleton (main chain) of the resins.Examples of the phenol resins include known polymers produced by reacting phenol with an aldehyde such as formaldehyde, acetaldehyde or furfural by an acid or alkali catalyst. Among them, preferred are those produced by reaction by an acid catalyst, such as novolac phenol resins.Examples of the rosins include rosins typified by natural rosin, polymerized rosin, modified rosin and esterified compounds thereof, and hydrogenated products thereof.Examples of the petroleum resins include C5 resins, C9 resins, C5 / C9 resins, dicyclopentadiene (DCPD) resins, C9 / DCPD resins, and hydrogenated products of these resins. Among these, DCPD resins, hydrogenated DCPD resins, C9 / DCPD resins, and C9 / hydrogenated DCPD resins are preferable.The terpene resins refer to polymers containing terpene as structural units. Examples include polyterpene resins produced by polymerizing terpene compounds and aromatic modified terpene resins produced by polymerizing terpene compounds and aromatic compounds. Examples of usable aromatic modified terpene resins include terpene-phenol resins from the terpene compounds and phenolic compounds, terpene-styrene resins from the terpene compounds and styrene compounds, and terpene-phenol-styrene resins from the terpene compounds, phenolic compounds, and styrene compounds. Examples of the terpene compounds include α-pinene and β-pinene. Examples of the phenolic compounds include phenol and bisphenol A. Examples of the aromatic compounds include styrene compounds such as styrene and α-methylstyrene. Among these, aromatic modified terpene resins are preferred.The acrylic resins refer to polymers containing acrylic monomers as structural units. Examples include styrene-acrylic resins such as those containing carboxy groups, which are produced by copolymerization of aromatic vinyl monomer components and acrylic monomer components. Among these, solvent-free, carboxy group-containing styrene-acrylic resins are suitably usable.The resins may be commercially available from, for example, Maruzen Petrochemical Co., Ltd., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Tosoh Corporation, Rutgers Chemicals; BASF, Arizona Chemical, ExxonMobil, KRATON, Nitto Chemical Co., Ltd., Nippon Shokubai Co., Ltd., ENEOS Corporation, Arakawa Chemical Industries, Ltd., Taoka Chemical Co., Ltd., etc.Preferred sustainability plasticizers are vegetable origin plasticizers such as the vegetable origin oils and farnesene polymers.The term "farnesene polymer" refers to a polymer produced by polymerizing farnesene and containing a farnesene-based structural unit. Farnesene has isomers such as α-farnesene ((3E,7E)-3,7,11-trimethyl-1,3,6,10-dodecatetraene) and β-farnesene (7,11-dimethyl-3-methylene-1,6,10-dodecatriene). Preferred is (E)-β-farnesene having the following structure: The farnesene polymers can be either homopolymers of farnesene (farnesene homopolymers) or copolymers of farnesene and vinyl monomers (farnesene-vinyl monomer copolymers). These may be used alone or in combinations of two or more. Among these, copolymers of farnesene and vinyl monomers are preferred.Examples of the vinyl monomers include aromatic vinyl compounds such as styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, α-methylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, 4-tert-butylstyrene, 5-t-butyl-2-methylstyrene, vinylethylbenzene, divinylbenzene, trivinylbenzene, divinylnaphthalene, tert-butoxystyrene, vinylbenzyldimethylamine, (4-vinylbenzyl)dimethylaminoethyl ether, N,N-dimethylaminoethylstyrene, N,N-dimethylaminomethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-t-butylstyrene, 3-t-butylstyrene, 4-t-butylstyrene, vinylxylene, vinylnaphthalene, vinyltoluene, vinylpyridine, diphenylethylene and diphenylethylenes having a tertiary amino group, and conjugated diene compounds such as butadiene and isoprene. These may be used alone or in combinations of two or more. Among these, butadiene is preferred. In other words, copolymers of farnesene and butadiene (farnesene-butadiene copolymers) are preferred among the farnesene-vinyl monomer copolymers.The copolymerization ratio of farnesene and vinyl monomers (farnesene / vinyl monomers) of the farnesene-vinyl monomer copolymers is preferably 40 / 60 to 90 / 10 by mass.Farnesene polymers having a weight average molecular weight (Mw) of 3000 to 300000 can be suitably used. The Mw of the farnesene polymers is preferably 8000 or more, and more preferably 10000 or more, while it is preferably 100000 or less, more preferably 60000 or less, and even more preferably 50000 or less. When the weight average molecular weight is within the above range, the advantageous effect tends to be better obtained.Farnesene polymers that are liquid or solid at room temperature (25°C) may be useful. Of these, liquid farnesene polymers which are liquid at room temperature (25°C) are desirable.The amount of plasticizers (total amount of plasticizers) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 30 parts by mass or less, more preferably 10 parts by mass or less, and even more preferably 5 parts by mass or less. The lower limit is not limited and may be 0 parts by mass. For example, the amount may be 1 part by mass or more, 2 parts by mass or more, or 3 parts by mass or more. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of plasticizers includes the amounts of oils and resins contained in oil-extended rubbers and resin-extended rubbers.The amount of solid plasticizers solid at room temperature (25° C.) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 30 parts by mass or less, more preferably 10 parts by mass or less, even more preferably 5 parts by mass or less, and may be 0 parts by mass. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of the resins solid at room temperature (25°C) and the amount of the aromatic vinyl polymers solid at room temperature (25°C) are preferably within the above range.The amount of liquid plasticizers liquid at room temperature (25° C.) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 30 parts by mass or less, more preferably 10 parts by mass or less, even more preferably 5 parts by mass or less, and may be 0 parts by mass. For example, the amount may be 1 part by mass or more, 2 parts by mass or more, or 3 parts by mass or more. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of the liquid plasticizers includes the amounts of oil contained in oil-extended rubbers and liquid resins contained in resin-extended rubbers extended with liquid resins.The amount of oil which is liquid at room temperature (25°C) is preferably within the above range.The amount of plasticizers (total amount of plasticizers) per 100 parts by mass of the rubber component in the inner liner rubber composition is preferably 50 parts by mass or less, more preferably 30 parts by mass or less, and even more preferably 10 parts by mass or less. The lower limit is not limited and may be 0 parts by mass. For example, the amount may be 1 part by mass or more, 2 parts by mass or more, or 3 parts by mass or more. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of plasticizers includes the amounts of oils and resins contained in oil-extended rubbers and resin-extended rubbers.The amount of solid plasticizers solid at room temperature (25° C.) per 100 parts by mass of the rubber component in the inner liner rubber composition is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and even more preferably 10 parts by mass or less. The lower limit is not limited and may be 0 parts by mass. For example, the amount may be 1 part by mass or more, 2 parts by mass or more, or 3 parts by mass or more. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of the resins solid at room temperature (25°C) and the amount of the aromatic vinyl polymers solid at room temperature (25°C) are preferably within the above range.The amount of liquid plasticizers liquid at room temperature (25° C.) per 100 parts by mass of the rubber component in the inner liner rubber composition is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and even more preferably 10 parts by mass or less. The lower limit is not limited and may be 0 parts by mass. For example, the amount may be 1 part by mass or more, 2 parts by mass or more, or 3 parts by mass or more. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of the liquid plasticizers includes the amounts of oil contained in oil-extended rubbers and liquid resins contained in resin-extended rubbers extended with liquid resins.The amount of oil which is liquid at room temperature (25°C) is preferably within the above range.In consideration of properties such as crack resistance and ozone resistance, the steel cord covering rubber composition and / or the inner liner rubber composition may contain an antioxidant.Non-limiting examples of the antioxidant include naphthylamine antioxidants such as phenyl-α-naphthylamine; diphenylamine antioxidants such as octylated diphenylamine and 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine; p-phenylenediamine antioxidants such as N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine and N,N'-di-2-naphthyl-p-phenylenediamine; quinoline antioxidants such as polymerized 2,2,4-trimethyl-1,2-dihydroquinoline; monophenolic antioxidants such as 2,6-di-t-butyl-4-methylphenol and styrenated phenol; and bis-, tris- or polyphenolic antioxidants such as tetrakis[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane. Among these, p-phenylenediamine antioxidant and quinoline antioxidant are preferred, with N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine or polymerized 2,2,4-trimethyl-1,2-dihydroquinoline being more preferred. Usable commercial products are available from Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., Ouchi Shinko Chemical Industrial Co., Ltd., Flexsys, etc.The amount of antioxidants per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 0.5 parts by mass or more, more preferably 1.5 parts by mass or more, still more preferably 2.0 parts by mass or more, and further preferably 2.5 parts by mass or more. The amount is preferably 7.0 parts by mass or less, more preferably 5.0 parts by mass or less, still more preferably 4.0 parts by mass or less, and further preferably 3.0 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of antioxidants per 100 parts by mass of the rubber component in the inner liner rubber composition is preferably 5.0 parts by mass or less, more preferably 3.0 parts by mass or less, even more preferably 1.5 parts by mass or less, more preferably 0.5 parts by mass or less, and may be 0 parts by mass. When the amount is within the above range, the advantageous effect tends to be better obtained.The steel cord covering rubber composition and / or the inner liner rubber composition preferably contains stearic acid.The amount of stearic acid per 100 parts by mass of the rubber component in the steel cord cover rubber composition and / or the inner liner rubber composition is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 2.0 parts by mass or more, while it is preferably 10 parts by mass or less, and more preferably 5 parts by mass or less.Here, stearic acids conventionally known, for example, including those available from NOF Corporation, Kao Corporation, FUJIFILM Wako Pure Chemical Corporation, Chiba Fatty Acid Co., Ltd., etc., can be used.The steel cord covering rubber composition and / or the inner liner rubber composition preferably contains zinc oxide.The amount of zinc oxide per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 2 parts by mass or more, more preferably 6 parts by mass or more, and even more preferably 10 parts by mass or more, while being preferably 20 parts by mass or less, and more preferably 15 parts by mass or less.The amount of zinc oxide per 100 parts by mass of the rubber component in the inner liner rubber composition is preferably 0.5 parts by mass or more, more preferably 0.8 parts by mass or more, and even more preferably 1.5 parts by mass or more, while being preferably 5.0 parts by mass or less, and more preferably 3.0 parts by mass or less.Here, zinc oxides conventionally known, for example, including those available from Mitsui Mining & Melting Co., Ltd., Toho Zinc Co., Ltd., HakusuiTech Co., Ltd., Seido Chemical Industry Co., Ltd., Sakai Chemical Industry Co., Ltd., etc., can be used.The steel cord cover rubber composition and / or the inner liner rubber composition may contain a wax.The amount of wax per 100 parts by mass of the rubber component in the steel cord cover rubber composition and / or the inner liner rubber composition is preferably 10.0 parts by mass or less, more preferably 2.0 parts by mass or less, and may be 0 parts by mass.Any wax may be used, and examples include petroleum waxes, natural waxes, and synthetic waxes produced by purifying or chemically treating a plurality of waxes. These waxes may be used alone or in combinations of two or more.Examples of petroleum waxes include paraffin waxes and microcrystalline waxes. Any natural wax derived from non-petroleum resources is useful. Examples include vegetable waxes such as candelilla wax, carnauba wax, Japan wax, rice wax and jojoba wax; animal waxes such as beeswax, lanolin and walrate; mineral waxes such as ozokerite, ceresin and petrolatum; and purified products of these waxes. Usable commercial products are available from, for example, Ouchi Shinko Chemical Industrial Co., Ltd., Nippon Seiro Co., Ltd., Seiko Chemical Co., Ltd., etc.The steel cord cover rubber composition and / or the inner liner rubber composition may contain sulfur.The amount of sulfur, if present, in the steel cord cover rubber composition per 100 parts by mass of the rubber component is preferably 2 parts by mass or more, more preferably 4 parts by mass or more, still more preferably 6 parts by mass or more, and further preferably 8 parts by mass or more. The amount is preferably 15 parts by mass or less, and more preferably 10 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.The amount of sulfur, if present, in the inner liner rubber composition per 100 parts by mass of the rubber component is preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and even more preferably 1.2 parts by mass or more. The amount is preferably 2.5 parts by mass or less, more preferably 2.0 parts by mass or less, and even more preferably 1.5 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.Examples of sulfur include those conventionally used in the rubber industry, such as sulfur powder, precipitated sulfur, colloidal sulfur, insoluble sulfur, highly dispersible sulfur, and soluble sulfur. Usable commercial products are available from Tsurumi Chemical Industry Co., Ltd., Karuizawa Sulfur Co., Ltd., Shikoku Chemicals Corporation, Flexsys, Nippon Karyu Industry Co., Ltd., Hosoi Chemical Industry Co., Ltd., etc. These may be used alone or in combinations of two or more.The steel cord cover rubber composition and / or the inner liner rubber composition preferably contains a vulcanization accelerator.The amount of vulcanization accelerators in the steel cord cover rubber composition and / or the inner liner rubber composition is not limited, and can be freely determined according to the desired vulcanization rate and crosslinking density. However, the amount per 100 parts by mass of the rubber component is preferably 0.1 parts by mass or more, more preferably 0.2 parts by mass or more, still more preferably 0.3 parts by mass or more, still more preferably 0.6 parts by mass or more, and further preferably 1.0 parts by mass or more. The upper limit is preferably 8.0 parts by mass or less, more preferably 7.0 parts by mass or less, still more preferably 6.0 parts by mass or less, more preferably 4.0 parts by mass or less, and more preferably 2.0 parts by mass or less.Any type of vulcanization accelerator may be used, including those generally used. Examples of vulcanization accelerators include benzothiazole vulcanization accelerators such as 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide and N-cyclohexyl-2-benzothiazylsulfenamide; thiuram vulcanization accelerators such as tetramethylthiuram disulfide (TMTD), tetrabenzylthiuram disulfide (TBzTD), and tetrakis(2-ethylhexyl)thiuram disulfide (TOT-N); sulfenamide vulcanization accelerators such as N-cyclohexyl-2-benzothiazolesulfenamide, N-t-butyl-2-benzothiazolylsulfenamide, N-oxyethylene-2-benzothiazolesulfenamide, and N,N'-diisopropyl-2-benzothiazolesulfenamide; and guanidine vulcanization accelerators such as diphenylguanidine, diorthotolylguanidine and orthotolylbiguanidine. These may be used alone or in combinations of two or more. Among these, sulfenamide vulcanization accelerators, guanidine vulcanization accelerators and benzothiazole vulcanization accelerators are preferred.The steel cord covering rubber composition may contain a cobalt salt of an organic acid, a thermosetting resin and the like.Here, the term "thermosetting resin" refers to a resin that can cause an effective reaction with heat and is not extractable with solvents unlike resins included in plasticizers. This feature distinguishes thermoplastic resins from resins comprised by plasticizers.Examples of the cobalt salt of an organic acid include cobalt stearate, cobalt naphthenate, cobalt neodecanoate, cobalt boron-3-neodecanoate and cobalt abietate. Useful commercial products are available from DIC Corporation, etc. These may be used alone or in combinations of two or more. Among these, cobalt stearate is preferred.The amount of the cobalt salt of an organic acid per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 0.5 parts by mass or less, more preferably 0.2 parts by mass or less, still more preferably 0.1 parts by mass or less, and may be 0 parts by mass. When the amount is within the above range, the advantageous effect tends to be better obtained.Suitable examples of thermosetting resins include resorcinol condensates (resorcinol resins) and phenol resins. These may be used alone or in combinations of two or more.Examples of useful resorcinol condensates include compounds (resins) represented by the following formula: wherein n is an integer of 1 or more.The resorcinol condensates may be modified resorcinol condensates. Examples of usable modified resorcinol condensates include compounds (resins) represented by the following formula: wherein n is an integer of 1 or more and R is an alkyl group.Useful commercial resorcinol condensates are available from Taoka Chemical Co., Ltd., INDSPEC Chemical Corporation, etc.Phenolic resins can be produced by reacting phenol with an aldehyde, such as formaldehyde, in the presence of an acid or alkali catalyst.The phenolic resins may be modified phenolic resins prepared by modifying phenolic resins with cashew oil, tall oil, rosin, etc. Among the modified phenol resins, cashew oil-modified phenol resins are preferred. Examples of usable cashew oil-modified phenol resins include compounds (resins) represented by the following formula: wherein p is an integer of 1 to 9, preferably 5 or 6.Useful commercial phenolic resins are available from Sumitomo Bakelite Co., Ltd., etc.The amount of thermosetting resins per 100 parts by mass of the rubber component in the steel cord cover rubber composition is preferably 1 part by mass or more, and more preferably 3 parts by mass or more, while being preferably 15 parts by mass or less, and more preferably 10 parts by mass or less. When the amount is within the above range, the advantageous effect tends to be better obtained.In addition to the above-mentioned components, the steel cord cover rubber composition and the inner liner rubber composition may suitably contain agents commonly used in the tire industry, such as release agents or other materials.Kneading conditions are as follows. In a basic kneading step of kneading additives other than crosslinking agents (vulcanizing agents) and vulcanization accelerators, the kneading temperature is preferably 100° C. or higher, and more preferably 120° C. or higher, while it is preferably 180° C. or lower, and more preferably 170° C. In a final kneading step of vulcanizing agents and vulcanization accelerators, the kneading temperature is preferably 80° C. or higher, while it is preferably 120° C. or lower, and more preferably 110° C. or lower. The composition obtained after kneading vulcanizing agents and vulcanization accelerators is usually vulcanized by, for example, press vulcanization. The vulcanization temperature is preferably 120° C. or higher, and more preferably 140° C. or higher, while it is preferably 190° C. or lower, and more preferably 185° C. or lower.The tire of the present invention is produced using the steel cord cover rubber composition and the inner liner rubber composition by conventional methods. More specifically, unvulcanized rubber compositions containing necessary additives are extruded into the shapes of tire components such as a carcass, a belt and an inner liner, and then are molded on a tire building machine by conventional methods. The resulting tire components are assembled with other tire components to produce an unvulcanized tire. Then, the unvulcanized tire is heated and pressurized in a vulcaniser, whereby a tire can be produced.Non-limiting examples of the tire include pneumatic tires, full tires, and airless tires. Among these, pneumatic tires are preferred.The tire is suitably used as a passenger car tire, a large passenger car tire, a large SUV tire, a truck or bus tire, a motorcycle tire, a racing tire, a winter tire (studless tire, snow tire, stud tire), a whole year tire, a run flat tire, an aircraft tire, a tire for mining vehicles, etc.A thickness T (mm) of the tire component in the tire is preferably 0.5 mm or more, more preferably 0.6 mm or more, still more preferably 0.7 mm or more, more preferably 0.8 mm or more, and further preferably 1.0 mm or more. The upper limit of the thickness T of a cap tread is preferably 3.5 mm or less, more preferably 3.2 mm or less, even more preferably 3.0 mm or less, more preferably 2.5 mm or less, and more preferably 2.0 mm or less. If the thickness is within the above range, the advantageous effect tends to be better obtained.The mechanism by which the advantageous effect can be more effectively obtained by controlling the thickness T of the tire component within the above-mentioned range is not clear, but it is considered that the tire component having not more than a predetermined thickness can more effectively transmit the force to the adjacent components, while the tire component having not less than the predetermined thickness can reduce the likelihood of friction with other components. Thus, adhesion performance is likely to be improved even after deterioration by heat and moisture.Here, the thickness T of the tire component refers to the thickness of the tire component including a steel cord and a steel cord cover rubber composition that coats the steel cord in a cross section cut along a plane including the rotation axis of the tire component. The thickness is an average of thicknesses of the tire component measured at points on the surface of the tire component along normals of the points. When the tire component includes two or more layers, the thickness T of the tire component means the thickness of each layer.In the tire, a ratio (S / T) of the cord surface area S [mm 2] of the tire component defined by Expression (1) to the thickness T [mm] of the tire component is preferably 323 or higher, more preferably 1000 or higher, even more preferably 1050 or higher, more preferably 1100 or higher, more preferably 1131 or higher, more preferably 1319 or higher, more preferably 1508 or higher, more preferably 2011 or higher, more preferably 2262 or higher, and more preferably 6032 or higher. The upper limit of the ratio S / T is preferably 10000 or lower, more preferably 9000 or lower, even more preferably 8000 or lower, more preferably 7000 or lower, and more preferably 6500 or lower. When the ratio is within the above range, the advantageous effect tends to be suitably obtained.Here, a ratio (S / Tb) of the cord surface area S [mm 2] of the tire component defined by Expression (1) to a thickness Tb [mm] of each belt ply described below is also preferably within the above range.The mechanism by which the advantageous effect can be more effectively obtained by controlling the ratio S / T within the above-mentioned range is not clear, but it is considered that securing the predetermined cord surface area relative to the thickness of the tire component can reliably provide good adhesion. Thus, adhesion performance is likely to be improved even after deterioration by heat and moisture.In the tire, a ratio (T / K) of the thickness T [mm] of the tire component to the air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] of the inner liner (inner liner rubber composition) is preferably 0.03×10 -11 or higher, more preferably 0.04×10 -11 or higher, even more preferably 0.05×10 -11 or higher, more preferably 0.07×10 -11 or higher, and more preferably 0.10×10 -11 or higher. The upper limit of the ratio T / K is preferably 0.30×10 -11 or lower, more preferably 0.28×10 -11 or lower, even more preferably 0.27×10 -11 or lower, more preferably 0.25×10 -11 or lower, and more preferably 0.20×10 -11 or lower. When the ratio is within the above range, the advantageous effect tends to be suitably obtained.Here, a ratio (Tb / K) of the thickness Tb [mm] of each belt layer described below to the air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] of the inner liner is also preferably within the above-specified range.The mechanism by which the advantageous effect can be more effectively obtained by controlling the ratio T / K within the above range is not clear, but it is considered that securing a small air permeability coefficient K and the predetermined thickness of the tire component can reduce the invasion of air to be low. Thus, adhesion performance is likely to be improved even after deterioration by heat and moisture.An exemplary embodiment of the tire of the present invention will be described below with reference to drawings, but the present invention is not limited to the embodiment.Here, the dimensions of tire components are measured while the width between bead portions of the tire is fixed to the normal rim width. In the measurement of each dimension, a sample is cut out from the tire in a tire radial direction, and the width between bead edges on both sides of the sample is fixed to the normal rim width.Here, the dimensions of the parts of the tire for the tire are measured in a normal state unless otherwise specified.Here, the term "normal state" refers to a state in which the tire is mounted on a normal rim (not shown), is filled with a normal internal pressure, and is under no load.When measurement of the tire mounted on a normal rim is impossible, the dimensions and angles of the parts of the tire in a meridional cross section of the tire are measured in a cross section of the tire cut along a plane including the rotational axis, wherein the distance between right and left beads corresponds to the distance between the beads in the tire mounted on a normal rim.The term "normal rim" refers to a rim specified by the standard for each tire in a standard system including standards according to which the tire is provided, and may be, for example, "standard rim" having the applicable size listed in "JATMA YEAR BOOK" by The Japan Automobile Tire Manufacturers Association, Inc. (JATMA), "Measuring rim" listed in "Standards Manual" by The European Tire and Rim Technical Organization (ETRTO), or "Design rim" listed in "YEAR BOOK" by The Tire and Rim Association, Inc. (TRA). Reference is made herein to JATMA, ETRTO and TRA in this order, and if the referenced standard contains the applicable size, it is followed. Moreover, a normal rim for a tire, which is not defined by any of the standards, refers to a rim having the smallest diameter and secondly the narrowest width among the rims on which the tire can be mounted and can maintain the internal pressure, i.e., among the rims that do not cause air leakage between the rim and the tire.The term "normal internal pressure" refers to an air pressure specified for each tire by the standard in a standard system including standards according to which the tire is provided, and may be the maximum value shown in Table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" in JATMA "maximum air pressure", in ETRTO "inflation pressure", or in TRA. Similar to "normal rim", JATMA, ETRTO and TRA are referred to in this order and the corresponding standard is followed. Moreover, normal internal pressure for a tire which is not defined by any of the standards refers to a normal internal pressure of 250 kPa or more for another tire size which is defined by any of the standards for which the normal rim is listed as the standard rim. Here, when a plurality of normal internal pressures of 250 kPa or more are listed, the normal internal pressure refers to the smallest of these normal internal pressures.The term "normal load" herein refers to a load specified for each tire by the standard in a standard system including standards according to which the tire is provided, and may be the maximum value shown in Table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" in JATMA "maximum load capacity", in ETRTO "load capacity", or in TRA. Similarly to the "normal rim" and "normal internal pressure" described above, JATMA, ETRTO and TRA are referred to in this order, and the corresponding standard is followed. Moreover, for a tire which is not defined by any of the standards, a normal load W L is calculated by the following equations. W L: normal load (kg) V: virtual volume (mm 3) of tire Dt: outer diameter (mm) of tire Ht: cross-sectional height T (mm) of tire Wt: cross-sectional width (mm) of tireThe term "cross-sectional width Wt (mm)" of the tire refers to the width of the tire in the normal state corresponding to the largest distance between outer surfaces of sidewalls other than patterns, letters, and the like on the sides of the tire, if present.The term "outer diameter Dt (mm)" of the tire refers to the outer diameter of the tire in the normal state.The term "tire cross-sectional height Ht (mm)" refers to the height in the tire radial direction in a radial cross section of the tire. If a rim diameter of the tire is R (mm), the height is half of the difference between the outer diameter Dt of the tire and the rim diameter R. In other words, the cross-sectional height Ht can be determined by (Dt-R) / 2.FIG. 1 is a meridional cross-sectional view of a tire 2 (pneumatic tire) in the normal state including the rotation axis of the tire according to the present embodiment.In FIG. 1, a vertical direction corresponds to the radial direction of the tire 2, a horizontal direction corresponds to an axial direction of the tire 2, and a direction perpendicular to the paper corresponds to a circumferential direction of the tire 2. a tread portion 4 includes a cap layer 30 and a base layer 28.Although FIG. 1 shows an example of a two-layer tread portion 4 consisting of a cap layer 30 and a base layer 28, the tread portion 4 may comprise a single-layer tread or a three- or multi-layer tread.In the tire 2, each sidewall 6 extends radially substantially inward from an edge of the tread portion 4. A radially inner portion of the side wall 6 is bonded with a clinching 10. The sidewall 6 can prevent damage to a carcass 14.In Fig. 1, each wing 8 is located between the tread portion 4 and the sidewall 6. the wing 8 is bonded to both the tread portion 4 and the sidewall 6.Each clinching 10 is located radially substantially inward of the side wall 6 and has at least one part that comes into contact with a rim.The carcass 14 includes a carcass ply 36.In the tire 2, the carcass ply 36 extends between bead cores 32 on opposite sides along the tread portion 4 and the sidewalls 6. Due to the folding, the carcass ply 36 is provided with a main portion 36 aand a pair of folded portions 36 b. Namely, the carcass ply 36 includes the main portion 36a and a pair of the folded portions 36b.Each bead core 32 includes a bead apex 34 extending radially outward from the bead core 32. The bead core 32 has a ring shape and preferably includes a wound non-stretchable wire. The bead apex 34 is tapered radially outward.Although not shown, the carcass ply 36 is preferably composed of a large number of parallel cords and a cover rubber. The absolute value of the angle of each cord with respect to the equator is suitably from 75° to 90°. In other words, the carcass 14 preferably has a radial structure.In Fig. 1, a belt layer 16 is located radially inward of the tread portion 4. The belt layer 16 reinforces the carcass 14. In the tire 2 in FIG. 1, the belt layer 16 consists of an inner layer 38 and an outer layer 40.In the inner layer 38 and the outer layer 40 in the tire 2 in FIG. 1, a steel cord is coated with the steel cord covering rubber composition, and a ratio (S / K) of the cord surface area S [mm 2] of the steel cord defined by Expression (1) in the inner layer 38 and / or the outer layer 40 to the air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] at 40° C. of the inner liner 20 is 70×10 -11 or higher. In the inner layer 38 and the outer layer 40, the steel cord covering rubber composition contains at least one selected from the group consisting of compounds represented by formula (2) and the compounds represented by formula (3).As can be seen from FIG. 1, the inner layer 38 is preferably slightly wider than the outer layer 40 in the axial direction. In the tire 2, the axial width of the belt layer 16 is preferably at least 0.6 times, but preferably not more than 0.9 times, the cross-sectional width of the tire 2.FIG. 2 is an enlarged view of the belt layer 16 (the inner layer 38 and the outer layer 40) and a band layer 18.As shown in FIG. 2, each belt ply 17 includes belt cords 17A and a cover rubber 17B (the steel cord cover rubber composition) that coats the belt cords 17A. The belt cords 17A are made of the steel cord. Although the belt cords have a circular cross section in the present embodiment, they are not limited to this embodiment and may have other shapes in a cross section such as an oval or polygonal shape. In view of properties such as durability, the cords may be preformed before use.For example, as shown in FIG. 2, the belt plies 17 include a first belt ply (the inner layer 38) and a second belt ply (the outer layer 40) that abuts the first belt ply in the tire radial direction. The second belt ply (the outer layer 40) is located outside the first belt ply (the inner layer 38) in the tire radial direction.The belt cords 17A can reduce deformation of the belt plies 17 during driving. The belt cords 17A in the first belt ply (the inner layer 38) and the belt cords 17A in the second belt ply (the outer layer 40) may have the same shape or different shapes.For example, the belt cords 17A are preferably inclined at an angle of 15 to 45 degrees with respect to the tire circumferential direction. Here, the angle of the belt cords 17A with respect to the tire circumferential direction is an angle between the belt cords 17A and the tire circumferential direction on the tire equator. The angle between the belt cords 17A and the tire circumferential direction can be measured by separating the tread portion and the like from the tire for exposing the belt cords 17A on the surface of the tire.The belt cords 17A in the first belt ply (the inner layer 38) and the belt cords 17A in the second belt ply (the outer layer 40) are preferably inclined in opposite directions to cross with respect to the tire circumferential direction, although the present invention is not limited to this embodiment.In view of adhesion to the rubber coating composition surrounding the belt cords 17A, coating containing copper and zinc is preferably applied to the surface of the belt cords 17A. More preferably, the applied coating contains a metallic element whose ionization tendency is between that of copper and zinc, such as cobalt, nickel, bismuth, or antimony, in addition to copper and zinc.In view of adhesion to the surrounding rubber composition, the belt cords 17A preferably have a polybenzoxazine bonding layer on the surface.The cover rubber 17B (the steel cord cover rubber composition) that coats the belt cords 17A preferably contains a known rubber material, as well as a phenol-type thermosetting resin, silica, an organic fatty acid salt, and a metal whose ionization tendency is between that of copper and zinc, such as cobalt, nickel, bismuth, or antimony as described above, a polybenzoxazine compound, or other materials.In FIG. 1, the band layer 18 is located radially outside the belt layer 16. The band layer 18 may have a greater width than the belt layer 16.The band layer 18 is preferably made of a cord and a cover rubber. The cord is spirally wound. This tape layer 18 has what is called a jointless structure. The cord extends substantially in the circumferential direction. The angle of the cord with respect to the circumferential direction is preferably 5° or smaller, or even 2° or smaller. The cord restricts the belt layer 16, thereby inhibiting lifting of the belt layer 16.The band layer 18 in the tire 2 may enhance the restraint of each belt ply 17 to enhance durability during high-speed driving, and may also impart good riding quality.An exemplary embodiment of the tape layer 18 includes an organic fiber cord 18A and a reinforcing rubber 18B that coats the organic fiber cord 18A. Usually, the organic fiber cord was subjected to a dipping treatment to improve adhesion to the rubber.Examples of the organic fiber constituting the organic fiber cord 18A include polyesters, polyamides, and celluloses. These fibers may be synthetic fibers or biomass-derived fibers. From the standpoint of ecobalance, the organic fiber is preferably derived from a recycled or recovered material. The fiber may be formed from a single component consisting of any of a synthetic fiber, a biomass fiber, and a recycled or recovered fiber. Also usable are hybrid cords obtained by entanglement of these fibers, multifilament cords obtained by combining the filaments of these fibers, and cords having a chemical structure in which the components are chemically bonded to each other.Examples of the polyester cords include polyethylene terephthalate (PET) cords, polyethylene naphthalate (PEN) cords, and polyethylene furanoate (PEF) cords. PEF cords can be used because they have excellent resistance to air permeability and can easily maintain the air pressure inside the tire as compared with other polyester cords. The polyester cords may be hybrid cords with other organic fibre cords, in which the polyester cords have been partially replaced by other organic fibre cords, such as polyamide fibre cords.FIG. 3 is an enlarged cross-sectional view showing the tread portion 4 and its vicinity in the tire 2. Tb denotes the thickness of each belt ply in the belt layer 16.The thickness Tb of each belt ply is preferably 0.5 mm or more, more preferably 0.6 mm or more, still more preferably 0.7 mm or more, more preferably 0.8 mm or more, and more preferably 1.0 mm or more, while being preferably 3.5 mm or less, more preferably 3.2 mm or less, still more preferably 3.0 mm or less, more preferably 2.5 mm or less, and more preferably 2.0 mm or less. When the thickness Tb is within the above range, the advantageous effect tends to be better obtained.The mechanism by which the advantageous effect can be more effectively obtained by controlling the thickness of each belt ply in the belt layer within the above-mentioned range is not clear, but it is considered that the belt ply having not more than the predetermined thickness can more effectively transmit the force of the belt layer to the adjacent components, while the belt ply having not less than the predetermined thickness can reduce the likelihood of friction between the belt layer and other components. Thus, adhesion performance is likely to be improved even after deterioration by heat and moisture.Here, the term "thickness of belt ply", i.e., the thickness of each reinforcing layer in the belt layer, refers to the thickness of each belt ply layer containing a steel cord and a belt layer rubber composition coating the steel cord in a cross section cut in a plane containing the rotational axis of the tire. The thickness is an average of thicknesses of each belt ply measured at points on the surface of the belt ply layer along the normal of the points. In the case of the belt layer 16 including two layers consisting of the inner layer 38 and the outer layer 40 in FIG. 2, the thickness of the inner layer 38 is an average of the thicknesses thereof measured at points on its inner layer surface along the normal of the points, while the thickness of the outer layer 40 is an average of the thicknesses thereof measured at points on its outer layer surface along the normal of the points.In the tire 2 in FIG. 1, an inner liner 20 is located inside the carcass 14. the inner liner 20 is bonded to an inner surface of the carcass 14. The inner liner 20 contains the inner liner rubber composition.Each bead band 22 is located adjacent a bead 12. The chafer 22 may be integrated with the clinching 10.In the tire 2, the tread portion 4 has grooves 26 including main grooves 42. As shown in FIG. 1, the tread portion 4 has a plurality, in particular three, of main grooves 42 engraved thereon. The main grooves 42 are axially spaced. Four ribs 44 extending in the circumferential direction are defined by the three main grooves 42 engraved on the tread portion 4. In other words, each main groove 42 is located between one rib 44 and another rib 44.The main grooves 42 extend in the circumferential direction. The main grooves 42 are continuous in the circumferential direction without discontinuity. The main grooves 42 promote drainage of water existing between a road surface and the tire 2, for example, in rainy weather. Thus, even when the road surface is wet, the tire 2 can sufficiently come into contact with the road surface.The cord surface area S of the tire component defined by Expression (1), the air permeability coefficient K at 40° C. of the inner liner, and the thickness T of the tire component in the tire 2 give S / K, S, K, T, S / T, and T / K, which are preferably within the above-mentioned ranges.EXAMPLESExamples (working examples) considered preferable for implementing the present invention will be described below, although the scope of the disclosure is not limited to these examples.Chemicals used in the production of tires are listed below. The chemicals are optionally purified by conventional techniques.(Belt Layer Rubber Composition)NR: TSR 20BR: BR 360L (cis-1,4-bond content: 98%) is available from Ube Industries, Ltd.Carbon black: DIABLACK LH (N 2 SA: 84 m 2 / g) available from Mitsubishi Chemical CorporationPhenol resin 1: PR-12686 (cashew oil modified phenol resin) available from Sumitomo Bakelite Co., Ltd.Phenol resin 2: PR-19900 (phenol resin) available from Sumitomo Bakelite Co., Ltd.Thermosetting resin: SUMIKANOL 620 (modified resorcinol condensate, softening point: 100° C.) available from Taoka Chemical Co., Ltd.Bismaleimide compound 1: BMI-1000 (4,4'-diphenylmethane bismaleimide (BMI), a compound represented by the above formula (2)) available from Daiwa Kasei Kogyo Co., Ltd.Bismaleimide compound 2: BMI-7000 (m-phenylene bismaleimide (PBMC), a compound represented by the above formula (2)) available from Daiwa Kasei Kogyo Co., Ltd.Benzoxazine Compound 1: Benzoxazine P-d (a compound represented by the above formula (3)), available from Shikoku Chemicals CorporationAntioxidant: NOCRAC 224 (polymerized 2,2,4-trimethyl-1,2-dihydroquinoline) available from Ouchi Shinko Chemical Industrial Co., Ltd.Zinc oxide: Zinc oxide #2 available from Mitsui Mining & Melting Co., Ltd.Stearic acid: stearic acid "TSUBAKI" available from NOF CorporationOil: Diana Process NS available from Idemitsu Kosan Co., Ltd.Organic acid cobalt salt: cobalt stearate (cobalt content: 9.55 mass %) available from IREC Co., Ltd.Polymerization agent: SUMIKANOL 507AP (hexamethylolmelamine pentamethyl ether) available from Taoka Chemical Co., Ltd.Sulfur: sulfur powder available from Karuizawa Sulfur Co., Ltd.Vulcanization Accelerator 1: NOCCELER NS (N-tert-butyl-2-benzothiazylsulfenamide) available from Ouchi Shinko Chemical Industrial Co., Ltd.Vulcanization accelerator 2: NOCCELER CZ (N-cyclohexyl-2-benzothiazolylsulfenamide) available from Ouchi Shinko Chemical Industrial Co., Ltd.Vulcanization accelerator 3: NOCCELER DZ (N,N-dicyclohexyl-2-benzothiazolylsulfenamide) available from Ouchi Shinko Chemical Industrial Co., Ltd.Vulcanization retardant: N-cyclohexylthio-phthalamide (CTP) available from Ouchi Shinko Chemical Industrial Co., Ltd.(Inner liner rubber composition)NR: TSR20Butyl-based rubber: bromobutyl 2255 (ExxonMobil), halogen content: 2.0 mass %)Carbon black: STERLING V (STSA: 36 m 2 / g) available from CabotZinc oxide: Zinc oxide #2 available from Mitsui Mining & Melting Co., Ltd.Stearic acid: stearic acid "TSUBAKI" available from NOF CorporationOil: Diana Process NS available from Idemitsu Kosan Co., Ltd.Sulfur: sulfur powder available from Karuizawa Sulfur Co., Ltd.Vulcanization accelerator: NOCCELER DM-P (Dibenzothiazylsulfenamid) available from Ouchi Shinko Chemical Industrial Co., Ltd.<Production of Belt Layer Rubber Composition>According to the formulation in Table 1 or 2, the materials other than the sulfur, the vulcanization accelerators, and the vulcanization retardant are kneaded in a 1,7-L Banbury mixer (Kobe Steel, Ltd.) at 140° C. for 10 minutes to obtain a kneaded mixture.The kneaded mixture is kneaded with the sulfur, the vulcanization accelerators, and the vulcanization retarder using an open mill at 100° C. for 10 minutes to obtain an unvulcanized belt layer rubber composition.< Step>The unvulcanized belt layer rubber composition is molded into a plate and then used for topping a steel cord according to the specification shown in Table 3, thereby preparing a composite of the steel cord and the unvulcanized belt layer rubber composition.<Production of Inner Liner Rubber Composition>According to the formulation in Table 4, the materials other than sulfur and vulcanization accelerators are kneaded in a 1,7-L Banbury mixer (Kobe Steel, Ltd.) at 140° C. for 10 minutes to obtain a kneaded mixture.The kneaded mixture is kneaded with the sulfur and the vulcanization accelerators using an open mill at 100° C. for 10 minutes to obtain an unvulcanized inner liner rubber composition.<Production of Test Tires>According to the specification shown in Table 1 or 2, the composite of the steel cord and the unvulcanized belt layer rubber composition and the unvulcanized inner liner rubber composition are respectively molded into the shapes of a belt layer and an inner liner. They are assembled with other tire components on a tire building machine to form an unvulcanized tire. The unvulcanized tire is vulcanized at 170° C. for 15 minutes, thereby producing a test tire (size 225 / 45R 18, a passenger car tire, FIGS. 1 and 2 ).The test tires manufactured according to the specifications, which varied as shown in Tables 1 and 2, are simulated. Tables 1 and 2 show the results calculated by the methods in the evaluations described below.<Air Permeability Coefficient>A test piece having a length of 15 mm, a width of 15 mm and a thickness of 0.4 mm is taken out from an inner liner of the test strip.The air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] of the test piece is measured in accordance with JIS K 7126-1:2006 at 40° C. for 30 minutes using a gas permeation analysis system (GTR TEC Corporation, GTR-11A / 31A).< Test>The test tire is degraded by heat and humidity at a temperature of 80° C. and an humidity of 80% RH for 168 hours. A steel belt having a cover rubber having a width of 25 mm and a length of 200 mm is cut out from the tire after degradation by heat and moisture. The sample thus prepared is subjected to a 90-degree peeling test at a pulling rate of 100 mm / min in accordance with JIS K 6854 to measure the peeling force [N]. A peeling force of 100 N or more indicates good peeling resistance.A peel test specimen with invisible steel cord derived metallic gloss is evaluated as acceptable, while a peel test specimen with visible steel cord derived metallic gloss is evaluated as unacceptable.[Table 1] Table 1][Table 3] [Table 3]Diameter [mm] of single cord0,300,300,300,200,400,40Number of twisted cordstwo two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two twotwo two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two twotwo two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two two twofour four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four fourone one one of one onesfour four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four four fourNumber of twisted cords per meter of tire component in tire width direction60070080080012001200Cord surface area S [mm 2]113113191508201115086032[Table 4]Exemplary embodiments of the present invention include:Embodiment 1. A tire comprising:a tire component including a steel cord coated with a steel cord cover rubber composition; andan inner liner,wherein the tire component has a ratio of S to K (S / K) of 70×10 -11 or higher, wherein S denotes a cord surface area S [mm 2] defined by Expression (1) below, and K denotes an air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] at 40° C. of the inner liner,Expression (1):Cord surface area S [mm 2] = diameter [mm] of single cord × π × number of twisted cords × number of twisted cords per meter of tire component in tire width direction × 1 [mm],wherein the steel cord cover rubber composition contains at least one selected from the group consisting of compounds represented by the following formula (2) and compounds represented by the following formula (3): wherein A represents a C2-C4alkylene group, a phenylene group or a C6-C29divalent hydrocarbon group having one to four aromatic rings, and R 11 to R 14 each independently represent a hydrogen atom, a C1-C5alkyl group, a -NH 2- group or a -NO 2- group;wherein R 21 represents a saturated aliphatic hydrocarbon group, an aromatic hydrocarbon group, or a group consisting of a combination of two or more of these groups, R 22 and R 23 are the same or different and each independently represent a C1-C10hydrocarbon group optionally having a substituent, n each independently represents an integer of 0 to 4, a plurality of R 22 may be the same or different from each other, and a plurality of R 23 may be the same or different from each other.Embodiment 2. the tire according to Embodiment 1, wherein the steel cord cover rubber composition contains a rubber component containing an isoprene-based rubber in an amount of 90% by mass or more based on 100% by mass of the rubber component.Embodiment 3. The tire according to Embodiment 1 or 2, wherein the steel cord cover rubber composition contains a cobalt salt of an organic acid in an amount of 0.5 parts by mass or less per 100 parts by mass of the rubber component.Embodiment 4. The tire according to any combination with any one of Embodiments 1 to 3, wherein the tire component is at least one selected from the group consisting of a carcass and a belt layer.Embodiment 5. The tire according to any combination with any one of Embodiments 1 to 4, wherein the ratio S / K is 80×10 -11 or higher.Embodiment 6. The tire according to any combination with any one of Embodiments 1 to 5, wherein the cord surface area S is 1200 mm 2 or more.Embodiment 7. The tire according to any combination with any one of Embodiments 1 to 6, wherein the air permeability coefficient K is 15×10 -11[ cc·cm / cm 2 ·sec·cmHg] or less.Embodiment 8. The tire according to any combination with any of Embodiments 1 to 7, wherein a thickness T (mm) of the tire component is 0.6 to 3.2 mm.Embodiment 9. The tire according to any combination with any one of Embodiments 1 to 8, wherein a ratio (S / T) of the cord surface area S defined by Expression (1) of the tire component is [mm 2] to a thickness T (mm) of the tire component is 1000 to 10000.Embodiment 10. The tire according to any combination with any one of Embodiments 1 to 9, wherein a ratio (T / K) of a thickness T (mm) of the tire component to the air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] of the inner liner is 0.03×10 -11 to 0.30×10 -11.Embodiment 11. The tire according to any combination with any one of Embodiments 1 to 10, wherein an amount of the compounds represented by Formula (2) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 1.0 to 4.0 parts by mass.Embodiment 12 The tire according to any combination with any one of Embodiments 1 to 11, wherein an amount of the compounds represented by Formula (3) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 1.0 to 4.0 parts by mass.Embodiment 13. The tire according to any combination with any one of Embodiments 1 to 12, wherein an amount of fillers per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 35 to 70 parts by mass.Embodiment 14. The tire according to any combination with any one of Embodiments 1 to 13, wherein an amount of carbon black per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 35 to 70 parts by mass.Embodiment 15. The tire according to any combination with any one of Embodiments 1 to 14, wherein an amount of plasticizers per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 10 parts by mass or less.Embodiment 16. The tire according to any combination with any one of Embodiments 1 to 15, wherein an amount of sulfur per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 6 parts by mass or more.LIST OF REFERENCE CHARACTERS2 Tire 4 tread portion 6 sidewall 8 wing 10 clinching 12 bead 14 carcass 16 belt layer 17 belt ply 17A belt cord 17B cover rubber (coating rubber) 18 band layer 18A organic fiber cord 18B organic fiber cord coating reinforcing rubber 20 inner liner 22 bead band 26 groove 28 base layer 30 cover layer 32 bead core 34 bead apex 36 carcass ply 36 apre portion 36 bfolded portion 38 inner layer (first belt ply) 40 outer layer (second belt ply) 42 main groove 44 rib

Claims

A tire comprising: a tire component comprising a steel cord coated with a steel cord cover rubber composition; and an inner liner, wherein the tire component has a ratio of S to K (S / K) of 70×10 -11 or higher, wherein S denotes a cord surface area S [mm 2] defined by Expression (1) below, and K denotes an air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] at 40°C of the inner liner, Expression (1): Cord surface area S [mm 2] = diameter [mm] of single cord × π × number of twisted cords × number of twisted cords per meter of tire component in the tire width direction × 1 [mm], wherein the steel cord cover rubber composition comprises at least one selected from the group consisting of compounds represented by the following formula (2) and compounds represented by the following formula (3): wherein A represents a C2-C4alkylene group, a phenylene group, or a C6-C29divalent hydrocarbon group having one to four aromatic rings, and R 11 to R 14 each independently represent a hydrogen atom, a C1-C5 alkyl group, a -NH 2- group or a -NO 2- group; wherein R 21 represents a saturated aliphatic hydrocarbon group, an aromatic hydrocarbon group or a group consisting of a combination of two or more of these groups, R 22 and R 23 are the same or different and each independently represent a C1-C10 hydrocarbon group optionally having a substituent, n each independently represents an integer of 0 to 4, a plurality of R 22 may be the same or different, and a plurality of R 23 may be the same or different.The tire according to claim 1, wherein the steel cord cover rubber composition comprises a rubber component containing an isoprene-based rubber in an amount of 90% by mass or more based on 100% by mass of the rubber component.The tire according to claim 1 or 2, wherein the steel cord cover rubber composition comprises a cobalt salt of an organic acid in an amount of 0.5 parts by mass or less per 100 parts by mass of the rubber component.The tire according to any one of claims 1 to 3, wherein the tire component is at least one selected from the group consisting of a carcass and a belt layer.The tire according to any one of claims 1 to 4, wherein the ratio S / K is 80×10 -11 or higher.The tire according to any one of claims 1 to 5, wherein the cord surface area S is 1200 mm 2 or more.The tire according to any one of claims 1 to 6, wherein the air permeability coefficient K is 15×10 -11[ cc·cm / cm 2 ·sec·cmHg] or less.The tire according to any one of claims 1 to 7, wherein a thickness T (mm) of the tire component is 0.6 to 3.2 mm.The tire according to any one of claims 1 to 8, wherein a ratio (S / T) of the cord surface area S defined by the expression (1) of the tire component is [mm 2] to a thickness T (mm) of the tire component is 1000 to 10000.The tire according to any one of claims 1 to 9, wherein a ratio (T / K) of a thickness T (mm) of the tire component to the air permeability coefficient K [cc·cm / cm 2 ·sec·cmHg] of the inner liner is 0.03×10 -11 to 0.30×10 -11.The tire according to any one of claims 1 to 10, wherein an amount of the compounds represented by formula (2) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 1.0 to 4.0 parts by mass.The tire according to any one of claims 1 to 11, wherein an amount of the compounds represented by formula (3) per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 1.0 to 4.0 parts by mass.The tire according to any one of claims 1 to 12, wherein an amount of fillers per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 35 to 70 parts by mass.The tire according to any one of claims 1 to 13, wherein an amount of carbon black per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 35 to 70 parts by mass.The tire according to any one of claims 1 to 14, wherein an amount of plasticizers per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 10 parts by mass or less.The tire according to any one of claims 1 to 15, wherein an amount of sulfur per 100 parts by mass of the rubber component in the steel cord cover rubber composition is 6 parts by mass or more.

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