Motorcycle tire for running on rough terrain

Abstract

The invention provides a motorcycle tire for running on rough terrain, which exhibits excellent driving performance on both soft terrain and hard terrain. Crown blocks (21) and middle blocks (41) are arranged such that at least part of the sidewall face of each of the middle blocks overlaps with the sidewall face of one of the crown blocks in the tire circumferential direction. Each of the crown blocks (21) has an axially long rectangular shape having a circumferential length shorter than the axial length. The top face of each middle block (41) has a substantially pentagonal shape having an axial inner side (45), a pair of transverse sides (46) extending axially outwardly from the axially inner side (45) and inclined so that the circumferential length of the top face of the middle block (41) is gradually increased, and a pair of axially outer sides (47) extending axially outwardly from the axially outer ends (46o) of the transverse sides (46) and inclined so that the circumferential length of the top face of the middle block (41) is gradually decreased. Only an axially inner part of the top face of each of each middle block (41) contacts with the ground under a standard load state.

Description

technical field [0001] The present invention relates to a motorcycle tire for running on uneven ground in which the arrangement and shape of blocks are improved. Background technique [0002] A tire for motorcycles used for driving on rough terrain used for off-road use has a plurality of blocks formed on the tread portion. In such a tire, each block is embedded in the road surface, and the edge thereof is used to obtain traction and cornering force, thereby improving steering stability. [0003] Conventionally, there have been proposed tires for motorcycles for riding on rough terrain in which traction performance and cornering performance are improved by specifying the arrangement and shape of blocks. For example, the following Patent Document 1 proposes a motorcycle tire for running on uneven ground. On the basis of providing a slit in the crown block arranged in the central region of the tread portion, it is possible to maintain the tire when running straight. Traction...

AI Technical Summary

Problems solved by technology

[0004] However, even such tires are difficult to use on relatively soft road surfaces made of soil, mud, and sand (hereinafter, sometimes referred to as "soft road surfaces") and relatively hard road surfaces where soil, gravel, etc. are compacted ( Hereinafter, sometimes referred to as "hard road surface") both exhibit excellent driving performance

In particular, if the area of ​​the block tread is reduced in order to improve the traction performance and cornering performance on soft roads, there is a problem that the blocks will be chipped when driving on hard roads.

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