EVOLVING BICYCLE

Description

BE2025 / 5062 2 Finally, once the child has mastered the balance bike with pedals and stabilizers, they move on to a pedal bike without stabilizers. This transition, generally made by removing the stabilizers, can be frightening for the child. In some cases, it is also possible to raise the stabilizers to increase the tilting angle of the bike and allow the child to become more familiar with the balance required for a conventional bike, avoiding a complete tip-over. Furthermore, once mastered, the pedal bike offers greater maneuverability, allowing the child to fully develop their abilities. It is easy to understand that, apart from the transition from a bicycle with pedals and stabilizers to a classic pedal bicycle, other transitions generally require the purchase of a new type of bicycle. Therefore, teaching a child to ride a bicycle can be expensive. Furthermore, buying a new bicycle often implies having to dispose of the old one, thus raising the issue of recycling. In order to address this problem,Some bicycles allow you to follow the child's development by adapting to their size and needs at each learning stage. For example, we know from document US2019217914 of a convertible children's bicycle whose main components can be assembled in different ways to offer various configurations. The central frame, shaped like an arc, includes three mounting connectors allowing a front assembly (front wheel, fork, stem, and handlebars), a rear assembly (rear frame with one or two rear wheels), and a saddle to be attached to the central frame, using adapters. The bicycle can also be equipped with a pedal kit. The convertible bicycle in document US2019217914 can be transformed into a tricycle, balance bike, or pedal bike. The conversion from tricycle to balance bike is done by changing the two rear wheels to a single central wheel and moving the saddle to the top of the frame. The conversion from balance bike to pedal bike is done by adding the pedal kit and raising the rear frame attachments to the main frame. Unfortunately,Although the bicycle described in this document may have some advantages, it would benefit from improvement, particularly given the complexity of assembling its main components. Indeed, this bicycle has a large number of components that need to be attached to specific mounting connectors depending on the desired configuration, making assembly complex and susceptible to assembly errors. Furthermore, although such a bicycle according to US2019217914 can, through numerous and laborious modifications or assemblies, change from one configuration to another, the child's position remains essentially the same relative to the front part, which has a negative effect on the development of the child's posture, learning, balance, and abilities.10 There is therefore a real need to provide an adaptable bicycle which, on the one hand, offers simplicity of adaptation, allowing for a simple and quick transformation of the bicycle between the child's learning stages, limiting the risk of disassembly errors and thus in a safer manner, and on the other hand,which can adapt to the child's needs in terms of learning, development, and ergonomic adjustability in order to offer an optimal position for the child in all configurations of the convertible bicycle. One objective of the present invention is to overcome the challenges and prejudices of the state of the art. Another objective of the invention is to provide a convertible bicycle allowing the child to easily and easily transition from a tricycle position to a balance bike position to a conventional bicycle position and vice versa, limiting the number of manipulations and additional parts necessary for these modifications. In particular, one objective of the invention is to provide a convertible bicycle adapted to the learning and development of a child's posture in each position in order to offer an optimal position and prevent the risks of poor posture. Another objective of the present invention is to be able to offer the child, the young cyclist, a precise balance, stability, control and maneuverability, at each stage of their development and according to their needs.in order to provide him with a safe and reassuring experience and learning. 30 2025 / 5062 BE2025 / 5062 4 The present invention thus aims to overcome the drawbacks of the prior art by providing an evolving bicycle comprising a frame structure including a seat tube and at least one rear wheel, and a front part which includes a steering tube, a front fork, a handlebar and a front wheel, the frame structure includes a front frame connected to the front part 5 and including an upper arm and a lower arm, and a rear frame including a left base and a right base, each of the bases including an upper arm and a lower arm, characterized in that the frame structure includes a frame adjustment means arranged to connect the arm in a movable manner upper part of the front frame to the upper arms of the left and right bases of the rear frame, and at least one first pivoting means attached to connect the lower arm of the front frame to the lower arms of the left and right bases of the rear frame in a movable manner,the frame adjustment means includes at least one anchoring means connected to the upper arm of the front frame and having at least two, preferably at least three anchoring positions, and at least one locking means connected to the upper arms of the left and right bases of the rear frame arranged to cooperate with at least one anchoring means, and since the evolving elevator is arranged to be adjusted, by means of the adjustment means, between a first frame position in which the locking means cooperates with the first anchoring position of the anchoring means, a second frame position in which the locking means cooperates with the second anchoring position of the anchoring means, and preferably a third frame position in which the locking means cooperates with the third anchoring position of the anchoring means. The present invention also relates to an evolving bicycle 25 comprising a frame structure including a seat tube and at least one rear wheel, and a front part which includes a steering tube, a front fork, a handlebar and a front wheel,The frame structure comprises a front frame connected to the front part and comprising an upper arm and a lower arm, and a rear frame comprising a left base and a right base, each of the bases comprising an upper arm and a lower arm, characterized in that the frame structure comprises a frame adjustment means arranged to movably connect the upper arm of the front frame to the upper arms of the left and right bases of the rear frame, and at least one first pivoting means arranged to movably connect the lower arm of the front frame to the lower arms of the left and right bases of the rear frame, the frame adjustment means comprising at least one anchoring means connected to the upper arm of the front frame and having at least three anchoring positions, and at least one locking means connected to the upper arms of the left and right bases of the rear frame arranged to cooperate with at least one anchoring means, and in which the evolving elevator is arranged to be adjusted, by means of the adjustment means,between a first frame position in which the blocking means cooperates with the first anchor position of the anchoring means, a second frame position in which the blocking means cooperates with the second anchor position of the anchoring means, and a third frame position in which the blocking means cooperates with the third anchor position of the anchoring means. As can be seen, the evolving elevator according to the present invention15 comprises a front part and a frame structure. The front part comprises a steering tube, a front fork, a handlebar, and a front wheel. The frame structure comprises a front frame connected to the front part, a rear frame, a seat tube, and at least one rear wheel. The front frame and the rear frame are connected via their respective upper and lower arms. A pivoting means20 connects the lower arm of the front part to the lower arms of the left and right chainstays of the rear part in a pivoting manner. In a particularly advantageous manner,A frame adjustment means connects the upper arm of the front part to the upper arms of the left and right bases of the rear part in a movable manner. This adjustment means includes at least one anchoring means 25 connected to the upper arm of the front part and at least one locking means connected to the upper arms of the left and right bases of the rear part, cooperating with each other. The anchoring means has at least two anchoring positions and more particularly at least three anchoring positions, each anchoring position corresponding to a frame position, which can be adjusted between these 30 frame positions. In a particularly advantageous manner, the evolving bicycle according to the present invention allows, particularly thanks to the frame adjustment means 2025 / 5062 BE2025 / 5062 6 associated with the pivot means, overcoming the drawbacks of the prior art by providing a bicycle which, on the one hand, adapts to the child's needs at each stage or phase of development and, on the other hand, for which changing the frame position is easy and facilitated. Indeed, following the evolution / development of a child,The evolving lever5 according to the present invention is initially mounted in the first frame position, in which the locking means of the frame adjustment means cooperates with the first anchoring position of the anchoring means. This specific cooperation makes it possible to obtain a first frame position, presented as being the lowest relative to the ground, among all the frame positions (namely at least the second and at least the third frame positions). The advantage of this low frame structure is that it allows the child using the evolving lever5 to comfortably touch the ground with their feet, ensuring the stability necessary for the first stage of use and learning with the evolving lever5 according to the invention. In the first frame position, stability is also reinforced thanks to a steering angle resulting in a raised ground clearance. Indeed, and in a particularly surprising way, the combination made by the inventors of the means for adjusting the frame of the evolving bicycle according to the present invention with at least one first means for pivoting,allows the orientation of the front part of the convertible bicycle to be adjusted differently between the first, second, and third frame positions, respectively, in order to adapt and promote the development of the child's posture, prevent the risks of poor posture, and ultimately provide a precise balance between the stability, control, and maneuverability of the convertible bicycle of the invention. More precisely, the connection between the front part and the front frame is such that, in the first frame position, the front part of the frame structure imposes a certain angle of direction on the convertible bicycle, resulting in a high ground clearance and therefore a more stable convertible bicycle. This is particularly advantageous for starting the child's learning by allowing them to concentrate on gripping the handlebars and coordinating their feet and hands, which helps them gain self-confidence. 2025 / 5062 BE2025 / 5062 7 By the term "steering angle", the present invention means the salient angle between the sole and the axis of the steering tube,When the bicycle is upright on the ground. By the term "ground clearance," the present invention means the horizontal distance between the point where the axis of the steering tube intersects the ground and the point where the front tire touches the ground when the bicycle is upright on the ground. Thus, the smaller the steering angle, the greater the ground clearance, resulting in a more stable but less maneuverable bicycle. It is easily understood that it is advantageous to provide a convertible bicycle10 according to the present invention with greater stability and reduced maneuverability for a young child and, moreover, to decrease its rigidity and increase its maneuverability as the child grows and develops, while maintaining an optimal position and good posture. The frame structure in the first frame position therefore allows15 the child using the convertible bicycle to comfortably touch the ground with their feet. This prevents them from being on their tiptoes or having their legs excessively bent. Furthermore,The steering angle of the evolving bicycle, mounted in the first frame position, requires the handlebars to be arranged ergonomically, allowing the child to grip them easily. Thus, the child does not need to lean excessively forward with outstretched arms, nor find themselves with bent arms, which provides them with a safe, reassuring and optimized experience and learning. During the transition from the first frame position to the second frame position of the evolving bicycle according to the invention, the locking means of the frame adjustment means is arranged to cooperate with the second anchoring position 25 of the anchoring means. Furthermore, the pivot means allows the lower arms of the front part and the lower arms of the left and right bases of the rear frame to pivot relative to each other, in order to accompany the movement of the upper arm of the front part relative to the upper arms of the left and right bases of the rear part during the change of frame position 30 between respectively the first and second frame positions.allowing the frame structure to be raised. 2025 / 5062 BE2025 / 5062 8 This transition between the first frame position and the second frame position therefore implies a readjustment of certain elements of the evolving bicycle relative to each other, without having to assemble / mount different parts. This advantageously limits the number of manipulations and additional parts needed in order to avoid potential errors related to assembly / mounting, which could lead to safety problems. Due to the raising of the frame structure, the second frame position of the evolving bicycle according to the present invention therefore requires a frame structure that is higher relative to the ground than that in the first frame position. The advantage of this raised frame structure, respectively in the second frame position, is that it always allows the growing child using the convertible bicycle to comfortably touch the ground with their feet, providing them with stability and enabling them to propel themselves forward. However,In a particularly surprising way, as explained above, the flexibility of the convertible bike mounted in the second frame position is reduced compared to the first frame position, in favor of maneuverability. Indeed, by raising the frame relative to the ground, the inclination of the front part is modified, resulting in an increase in the steering angle and therefore a decrease in ground contact. This makes the convertible bike less stable but more maneuverable, in order to further the child's learning. In fact, the child will be able to become better familiar with steering, in addition to balance, also allowing them to further strengthen their self-confidence. The frame structure in the second frame position is adapted to the increasing height of the child in the same way that that in the first frame position is adapted to the height of the younger child. The child can comfortably touch the ground with his feet and grip the handlebars with his hands ergonomically, still providing him with a safe experience and learning,reassuring and optimized. During the transition from the second frame position to the third frame position of the evolving bicycle according to the invention, the frame adjustment locking means is arranged to cooperate with the third anchoring position of the anchoring means. In addition, the pivot means allows the lower arms of the front part and the lower arms of the left and right bases of the rear part to pivot relative to each other, in order to accompany the movement of the upper arm of the front part relative to the upper arms of the left and right bases of the rear part during the change of frame position between the second and third frame positions respectively, allowing the frame structure to be raised even further. Again, this transition between the second and third frame positions involves a readjustment of certain elements of the evolving bicycle relative to each other, without resorting to the assembly / mounting of different parts. This advantageously allows,In the same way as the transition between the first and second frame positions, the number of manipulations and additional parts required is limited to avoid potential assembly errors that could lead to safety problems. The convertible bicycle according to the invention, mounted in the third frame position, has a frame structure that is higher relative to the ground than that in the second frame position. As surprisingly as previously explained, the flexibility of the convertible bicycle mounted in the third frame position is further reduced compared to the first and second frame positions, in favor of improved handling. Indeed, by raising the frame even further relative to the ground, the inclination of the front frame is again modified, resulting in an increase in the steering angle and therefore a decrease in ground contact. This makes the evolving vehicle even less stable but all the more maneuverable, in order to continue the learning of the child who already largely masters balance and direction.allowing him to perfect his learning. 25 The frame structure in the third frame position is also adapted to the size of the older child. The child can move while maintaining an optimal posture on the convertible bike mounted in the third frame position, allowing him to finalize his learning in an optimized manner. It can also be envisaged that the said adjustment means be 30 reversed on the frame structure of the convertible bike according to the invention, with the said anchoring means 2025 / 5062 BE2025 / 5062 10 connected to the upper arms of said left and right bases of the rear frame and the said locking means connected to the upper arm of the front frame. Furthermore,It can also be envisaged that the convertible bicycle according to the invention comprises a second pivoting means designed to connect, in a movable manner, the upper arms of the left and right bases of the rear frame to the lower arms of the left and right bases of the rear frame. The second pivoting means allows the upper arms of the left and right bases of the rear frame and the lower arms of the left and right bases of the rear frame to pivot relative to each other, in order to accommodate the change in frame position. Preferably, the convertible bicycle according to the present invention in the first frame position corresponds to a tricycle. Preferably, the convertible bicycle according to the present invention in the second frame position corresponds to a balance bike. Preferably, the convertible bicycle according to the present invention in the third frame position corresponds to a pedal bicycle. In a particularly advantageous way, the evolutionary approach according to the present invention makes it possible to overcome the challenges and prejudices of the state of the art,by providing an adaptable bicycle with simple evolution that can adapt to the child's needs in terms of learning, development, and ergonomic adjustability in all configurations of the adaptable bicycle, particularly thanks to the frame adjustment means associated with the first pivot means. Also advantageously, the adaptable bicycle according to the present invention allows for easy and convenient transitions from a tricycle position, to a balance bike position, to a conventional bicycle position, and vice versa, limiting the number of manipulations and additional parts required for these modifications. Equally advantageously, the adaptable bicycle according to the invention offers an optimal position for the child, preventing the risks of poor posture, by being adapted to learning and postural development at each position. 2025 / 5062 BE2025 / 5062 11 Finally, and advantageously, the evolving elevator according to the invention offers a safe and reassuring learning experience for the child. It guarantees a precise balance of stability, control, and maneuverability.Adapting to each stage of the child's development and according to their needs, advantageously, the anchoring means for the convertible bicycle according to the present invention is chosen from the group comprising rails, notched rails, perforated bars, and notched ball joints. Advantageously, at least one locking means for the convertible bicycle according to the present invention comprises at least one fastening element cooperating with the at least one anchoring means, preferably at least one fastening element being chosen from the group comprising through screws, bolts and nuts, locking pins, clamping fasteners, and friction fasteners. Advantageously, the pivot point of the convertible bicycle according to the present invention is chosen from the group comprising hinges, joints, and ball joints. Preferably, the convertible bicycle according to the invention comprises a saddle adjustable in height to a saddle height, the saddle height being between a low saddle position and a high saddle position.and in which the seat tube is inclined with respect to a vertical axis and arranged so that the distance between the saddle and the front part is greater when the saddle is in the high saddle position than the distance between the saddle and the front part when the saddle is in the low saddle position. This configuration of the inclined seat tube advantageously allows adjustment of the distance between the saddle and the handlebar of the front part, in correlation with the saddle height. When the saddle height corresponds to the low saddle position, the distance between the saddle and the handlebar will be smaller than when the saddle height is located between the low saddle position and the high saddle position. The adjustable saddle height of the convertible bike according to the invention not only raises the child from the ground, but also increases the distance between the saddle and the handlebars. Thus, the bike adapts to the child's growth, taking into account the lengthening of their legs and arms, allowing them to maintain an ergonomic position on the convertible bike.whatever size. In a particular embodiment, the front fork is chosen from the group of simple forks, double-head forks and single-arm forks.5 Advantageously, the evolving lift according to the invention, being adjusted in the first frame position, comprises two rear wheels, which are connected to each other by means of a through tube connected to the rear frame, the two rear wheels being arranged on either side of the through tube, outside the rear frame, the through tube being connected to the rear frame between the two rear wheels.10 When the convertible scooter is in the first frame position, the presence of two rear wheels offers increased stability, essential for initiating the child's learning. In this configuration, the ground clearance is greater, which already contributes to making the scooter more stable. In addition, the two rear wheels, supported by a through tube, are positioned outside the frame and spaced apart from each other.This stability is reinforced by forming a triangle on the ground with the front wheel. This guarantees optimal stability and allows the child to become familiar with the bike while developing their self-confidence. The two rear wheels are each advantageously connected to the through tube by a hub. Also advantageously, the convertible bike according to the invention, being adjusted in a second frame position, comprises a rear wheel, which is connected and positioned inside the rear frame by a hub. When the convertible bike is in the second frame position, the presence of a single rear wheel located inside the rear frame reduces instability while increasing maneuverability. Combined with the ground clearance effect of the second frame position, this configuration further accentuates the decrease in instability while increasing the maneuverability of the convertible bike. It is ideal for accompanying the child in their learning of balance.The 30 direction and coordination. The decrease in elasticity forces the child to work actively to maintain their balance, an essential step in learning to ride a bicycle. The increased maneuverability offers greater freedom of movement, allowing the child to learn to steer the bicycle better. The single rear wheel of the convertible bicycle according to the invention in the second frame position is advantageously one of the two rear wheels of the convertible bicycle according to the invention in the first frame position comprising two rear wheels. The convertible bicycle in the second frame position according to the invention may optionally include at least one rear assist wheel. However, the convertible bicycle according to the invention without the presence of at least one rear assist wheel has the advantage of encouraging the child to work even more on their balance and facilitating their learning of steering. Moreover, when the child has started their learning with the convertible bicycle according to the invention in the first frame position,The transition to the evolving second-position frame is facilitated by familiarity with this specific bicycle. Thus, the addition of at least one rear assistance wheel is not necessarily required to continue learning. An equally advantageous convertible bicycle according to the invention, being adjusted to the third frame position, comprises a rear wheel, which is connected to and positioned inside the rear frame by a hub, and a pedal kit. 20 When the convertible bicycle is in the third frame position, the presence of a pedal kit allows the child's learning to be completed. After mastering balance, steering, and coordination, the child can now learn to pedal. The pedal kit is advantageously present on the convertible bicycle mounted in the third frame position, as this is the highest frame position relative to the ground. 25 This position prevents any contact between the pedal kit and the ground, thus ensuring optimal and unblocked operation of the kit. Preferably, the pedal kit for the convertible bicycle according to the present invention comprises pedals,cranks, a bottom bracket, a chainring, a drive mechanism, and a first sprocket comprising a first predetermined set of 30 teeth, the drive mechanism being chosen from the group comprising belts, chains, and universal joints. 2025 / 5062 BE2025 / 5062 14 In a particular embodiment, the first sprocket comprising a first predetermined set of teeth of the evolving bicycle according to the present invention is interchangeable with a second sprocket comprising a second predetermined set of teeth. Indeed, the evolving bicycle according to the invention may be a bicycle comprising a single first sprocket, which means that the bicycle is limited to a single speed, preventing the child from adapting the resistance of the pedal kit by changing speed. However, this first sprocket, comprising a predetermined first set of teeth, can be replaced by a second sprocket comprising a second predetermined set of teeth different from the first, thus allowing the speed of the evolving bicycle to be modified. Thus,It is advantageous to exchange the first sprocket for a second sprocket as the child develops their muscular strength, in order to adapt the pedaling resistance to their increasing abilities and promote optimal learning progress. A second sprocket with 15 fewer teeth than the first will require the child to exert more force to pedal, thus promoting the development of their muscular strength and allowing them to move faster. In a similar embodiment, the cranks of the convertible bicycle according to the present invention have a length between 70 and 100 mm, preferably between 75 and 95 mm. For example, the cranks of the convertible bicycle according to the present invention have a length of 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, or 100 mm. In a similar embodiment, the adjustable bicycle pedal kit according to the present invention has a Q factor between 25, 100, and 130 mm, preferably between 105 and 125 mm. For example, the Q factor of the adjustable bicycle according to the present invention has a value equal to 100 mm, 105 mm, 110 mm, 115 mm, 120 mm,125mm or 130mm. By the term factor Q, we mean the horizontal distance between the outer surfaces of the two cranks of the pedal kit, measured 30 perpendicular to the plane of the frame structure, that is to say the horizontal distance 2025 / 5062 BE2025 / 5062 15 between the points of contact of the two cranks with their respective pedal, measured perpendicular to the plane of the frame structure. The crank length, between 70 and 100 mm, combined with the Q factor of the pedal kit, between 100 and 130 mm, allows the child to have a smooth, easy, and rapid pedaling motion. Advantageously, the evolving elevator according to the invention, being adjusted in the third frame position, includes a braking kit, the braking kit being a front and / or rear brake, the front and / or rear brakes being chosen from the group including disc brakes, pad brakes,rim brakes and drum brakes. 10 Other embodiments of the convertible bicycle according to the invention are indicated in the attached claims. The invention also relates to a convertible bicycle system comprising: - A convertible bicycle according to the present invention, and - A rear wheel with a hub, and / or 15 - Two rear wheels with a through tube, and / or - A pedal kit, and / or - One or more sprockets comprising a predetermined series of teeth, and / or - A braking kit, and / or 20 - At least one rear assist wheel, and / or - A bell, and / or - At least one mudguard, and / or - At least one light, and / or - A kickstand. 25 Other embodiments of the convertible bicycle according to the invention are indicated in the attached claims. 2025 / 5062 BE2025 / 5062 16 Other features, details and advantages of the invention will become apparent from the following description, which is not exhaustive and refers to the drawings and examples. In the drawings,Figure 1a is a perspective view of an adjustable bicycle according to the present invention arranged in the first frame position. Figure 1b is a side view of an adjustable bicycle according to the present invention arranged in the first frame position. Figure 1c is a side view of a frame adjustment means in the first anchoring position according to the present invention. Figure 2a is a perspective view of an adjustable bicycle according to the present invention arranged in the second frame position. Figure 2b is a side view of an adjustable bicycle according to the present invention arranged in the second frame position. Figure 2c is a side view of a frame adjustment means in the second anchoring position according to the present invention. Figure 3a is a perspective view of an adjustable bicycle according to the present invention arranged in the third frame position. Figure 3b is a side view of an evolving bicycle according to the present invention arranged in the third frame position. Figure 3 is a side view of a frame adjustment means 20 in the third anchoring position according to the present invention. On the figures,Identical or analogous elements bear the same reference numerals. The convertible bicycle 1 according to the present invention is shown in the first frame position (FIG. 1a, 1b, 1c), in the second frame position (FIG. 2a, 2b, 2c), and in the third frame position (FIG. 3a, 3b, 3c). According to the embodiment of Figures 1a, 1b, and 1c, the convertible bicycle mounted in the first frame position is a tricycle. According to the embodiment of Figures 2a, 2b, and 2c, the convertible bicycle mounted in the second frame position is a balance bike. Finally, according to the embodiment of Figures 3a, 3b, and 3c, the convertible bicycle mounted in the third frame position is a pedal bicycle. The convertible bicycle 1 according to the present invention comprises a frame structure 2 and a front part 5. The front part 5 comprises a head tube 37, a front fork 6, a handlebar 7, and a front wheel 8. The frame structure 25 comprises a seat tube 3, at least one rear wheel 4, 4', a front frame 9, and a rear frame 12. The front fork 6 can be selected from the group comprising simple forks,double-T forks and single-arm forks. In a preferred embodiment of the present invention, the fork is a double-T fork.10 This double-T fork advantageously allows the front frame9 to be connected to the front part5, via the steering tube37, at several points, thus guaranteeing a solid and secure connection. Furthermore, the adjustable elevator 1 includes a saddle 29 mounted on the seat tube 3. This saddle 29 is height-adjustable to a position between a low and a high saddle position. The saddle height can vary between the low and high saddle positions. Advantageously, the seat tube 3 is inclined with respect to a vertical axis, such that the distance between the saddle 29 and the handlebar 7 is greater when the saddle is in the high saddle position than when it is in the low saddle position. This inclined configuration of the seat tube 3 allows the distance between the saddle 29 and the handlebar 7 to be adjusted according to the saddle height. Therefore,The adjustable seat1 according to the invention adjusts to the child's growth by increasing the seat height and the handlebar-saddle distance, ensuring an ergonomic position regardless of size.25 According to the embodiment of Figures 1a, 1 and 1c, the frame structure2 comprises two rear wheels 4, 4', while according to the embodiment of Figures 2a, 2b, 2c, 3a, 3 and 3c, the frame structure2 comprises one rear wheel 4. The front frame9 comprises an upper arm 10 and a lower arm 11, 30 and is connected to the front part 5. The rear frame12 comprises a left base 2025 / 5062 BE2025 / 5062 18 13 and a right base 14, each of the bases comprising an upper arm 15, 16 and a lower arm 17, 18. The front frame 9 and the rear frame 12 are connected to each other via a frame adjustment means 19 and at least one pivot means 20. Thus, the frame adjustment means 19 connects the upper arm 10 of the front frame 9 to the upper arms 15, 16 of the left base 135 and right base 14 of the rear frame 12 in a movable manner. According to the embodiments of figures 1, 2 and 3,The frame adjustment means 19 includes an anchoring means 21 and a release means 25. The anchoring means 21 is connected to the upper arm 10 of the front frame 9 and includes three anchoring positions 22, 23, 24, while the release means 25 is connected to the upper arms 15, 16 of the left 13 and right 14 bases of the rear frame 10 12 and is arranged to cooperate with the anchoring means 21. It can also be envisaged that the adjustment means 19 be reversed on the frame structure of the evolving bicycle 1, with the anchoring means 21 connected to the upper arms 15, 16 of said left 13 and right 14 bases of the rear frame 12 and said locking means 25 connected to the upper arm 10 of the front frame 9.15 The anchoring means 21 can be chosen from the group comprising rails, toothed rails, perforated bars and toothed ball joints. In a preferred embodiment of the present invention, the anchoring means is a toothed rail. The locking means 25 comprises a fastening element capable of cooperating with at least one anchoring means 21. The fastening element can 20 be chosen from the group comprising through screws, bolts and nuts, locking pins,Clamping and friction fixings. In a preferred embodiment of the present invention, the fixing element is a through screw. The pivot means 20 connects in a movable manner the lower arm 1125 of the front frame 9 to the lower arms 17, 18 of the left 13 and right bases 14 of the rear frame 12. The pivot means 20 can be chosen from the group comprising hinges, joints, and ball joints. In a preferred embodiment of the present invention, the pivot means 20 is a joint. 30 2025 / 5062 BE2025 / 5062 19 The convertible bicycle 1 according to the embodiments of Figures 1, 2, and 3 also comprises a second pivot means 36. This second pivot means 36 connects in a movable manner the upper arms 15, 16 of the left 13 and right bases 14 of the rear frame 12 to the lower arms 17, 18 of the left 13 and right bases 14 of the rear frame 12.5 Thus, the convertible bicycle according to the invention can be adjusted between three frame positions 26, 27, 28, in particular thanks to the associated frame adjustment means 19 aumándepivot.Lorsquelemándeblocage25coopere avec la premiere position d'ancreation22, levéloevolutive,being a tricycle, is mounted in the first frame position 26. Then, when the locking means 25 cooperates with the 10 second anchoring position 23, the evolving vehicle, being a balance bike, is mounted in the second frame position 27. Finally, when the locking means 25 cooperates with the third anchoring position 24, the evolving vehicle, being a pedal bike, is mounted in the third frame position 28. The convertible bicycle, transitioning from a tricycle to a balance bike, then from a balance bike to a pedal bike, therefore has its frame structure raised relative to the ground. Indeed, the movement of the locking means relative to the anchoring means of the frame adjustment means, from a first anchoring position to a second or third position, causes the lower arm of the front part and the lower arms of the left and right bases of the rear part to pivot relative to each other, raising the pivot point, and therefore the frame structure, relative to the ground. Advantageously, these transformations do not require the assembly of different parts.avoiding potential errors. In addition, raising the frame structure allows the convertible bike to adapt to the child's growth, taking into account the lengthening of their legs. Moreover, the connection between the front part and the front frame is such that raising the frame structure results in a modification of the inclination of the front part, increasing the steering angle, which makes it possible to obtain a convertible bike that is less stable but more maneuverable. Indeed, the steering angle is increased when the frame structure is raised, implying a decrease in ground clearance. The smaller the ground clearance, the more the bike loses stability and gains maneuverability. Raising the frame structure therefore allows also to adapt to the child's learning. Figures 1a and 1b illustrate a method of embodiment of the evolving bicycle 1 mounted in the first frame position 26. In this embodiment, the evolving bicycle 1 is a tricycle comprising two rear wheels 4,4' connected together by 5 a through tube 30. The through tube is connected to the rear frame 12 and the two rear wheels 4, 4' are connected on the outside of the through tube 30 outside the rear frame 12. The through tube 30 is therefore connected to the said rear frame 12 between the two rear wheels 4, 4'. Figure 1 illustrates the configuration of the adjustment means 19 according to a preferred embodiment in the first anchoring position 22. The locking means 25 of the adjustment means 19 cooperates with the anchoring means 21. It locks the position of the upper arms 15, 16 of the left 13 and right bases 14 of the rear frame 12 relative to the upper arm 10 of the front frame 9 by cooperating directly with the first anchoring position 22 of the anchoring means 21. In this preferred embodiment, the anchoring means 21 is a toothed rail and includes an opening on each upper arm 15, 16 through which a through screw, being the fastening means of the locking means 25, can be fixed. The through screw will therefore fix the first frame position 26 by blocking a first opening.The toothed rail at the first anchoring position 22 and a second hole 20. From this first anchoring position 22, the tricycle presents the first frame position 26, which is the lowest relative to the ground among all frame positions. Advantageously, the child using it is therefore able to comfortably touch the ground with their feet, ensuring the great stability 25 necessary for this first stage of learning. In addition, the inclination of the front part 5 is such that it allows the child to easily grip the handlebars, maintaining an ergonomic posture. Figures 2a and 2b illustrate an embodiment of the evolving tricycle 1 in the second frame position 27. In this embodiment,The evolving balance bike 1 is 30 a balance bike comprising a rear wheel 4 connected to the rear frame 12 by a hub 31 located in its center. The rear wheel 4 is therefore positioned inside the rear frame 12. Figure 2 illustrates the configuration of the adjustment means 19 according to a preferred embodiment in the second anchoring position 23. In the same way as for the first anchoring position 22, the through screw will fix the second frame position 27 by holding a first hole, the toothed rail at the level of the second anchoring position 23 and a second hole. Due to this second anchoring position 23 of the anchoring means 21, the balance bike presents the second frame position 27, which is intermediate between the first 26 and the second 28. This has the advantage that 10 the child, at an intermediate stage of growth and learning, can still comfortably touch the ground with their feet and have an ergonomic position on the evolving balance bike 1. Figures 3a and 3b illustrate a method of implementing the evolving balance bike 1 in the third frame position 28. In this method of implementation,The evolving bicycle 1 is a pedal bicycle comprising a rear wheel 4 in the same way as the embodiment of figures 2a and 2b, as well as a pedal kit 32. The pedal kit 32 is composed of pedals 33, cranks 34, a bottom bracket, a chainring, a drive means and a first sprocket comprising a first set of predetermined teeth 35. The pedal kit 32 is advantageously installed on the evolving bicycle 1 in the third frame position 28, offering the frame structure 2 furthest from the ground, which allows the pedal kit to function without blocking due to contact with the ground. The drive means may be chosen from the group comprising belts, chains and gimbals. In a preferred embodiment of the present invention, the drive means is a belt. The first pinion comprising a first predetermined series of teeth 35 is interchangeable with a second pinion comprising a second predetermined series of teeth. In fact, the bicycle is limited to a single speed,However, this speed can be modified by changing the first sprocket 35 for a second sprocket 30 comprising a second predetermined set of teeth 2025 / 5062 BE2025 / 5062 22 different from the first. This allows the resistance of the pedal kit to be adapted to the child's strength. The convertible bicycle 1 may also include a braking kit in a preferred embodiment. The braking kit may be a front brake and / or a rear brake. These front and / or rear brakes may be chosen from group 5 comprising disc brakes, pad brakes, rim brakes, and drum brakes. In a preferred embodiment of the present invention, the braking kit is a rear brake, itself being a disc brake. Figure 3c illustrates this,

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