| 摘要 |
PROBLEM TO BE SOLVED: To improve performance on ice by forming at least a grounding part in a tread of a lamination, in which rubber layers possessing different abrasion resistances are layered adjacently at a specific density, and using a rubber layer possessing multiple particles for at least one rubber layer in the rubber layers layered in two or more layers. SOLUTION: In a tread 12 provided with a plurality of blocks 18 which are formed dividedly by means of a plurality of circumferential grooves 14 and a plurality of lateral grooves crossing the circumferential grooves 14, an upper layer cap part 12A directly grounding the road surface and a lower layer base part 12B arranged on the inside adjacently to the cap part 12A are provided. The cap part 12A is formed by layering low abrasion resistance rubber layers 20 and high abrasion resistance rubber layers 22 alternately in the tire width direction, and these rubber layers 20, 22 are layered at a density of two layers or more per 10mm. Each rubber layers 20, 22 is formed of rubber containing multiple particles, and the percentage content of the particles is set to 16-30% by weight in the rubber layer 20, while it is set to 1-15% by weight in the rubber layer 22. |
