| 摘要 |
PURPOSE:To enhance control stability by forming the length along auxiliary grooves which extend in such a way to cross with main grooves obliquely longer than the length along the main grooves which extend in the circumferential direction of a tyre in linear, in blocks formed in the tread of the tyre. CONSTITUTION:In the tread of a tyre, plural blocks 4 are formed with respective plural main grooves 1 and auxiliary grooves 2. The main grooves 1 are provided in linear along the circumferential direction of the tyre. In addition, the auxiliary grooves 2 are provided in linear or in curved form in S shape in the direction which crosses with the main grooves 1 obliquely. Further, the auxiliary grooves 2 are provided continuously at least from one ground end 3 of the tyre tread to the other ground 3'. In the above construction, in the blocks 4 the length along the auxiliary grooves 2 is longer than that along the main grooves 1. With this arrangement, the blocks 4 of the tyre are formed in optimal form when specific oblique force is added from ground surface at the time of turning of an automobile. |
