| 摘要 |
PROBLEM TO BE SOLVED: To improve both on-ice performance and wear resisting performance, in a stud-less tire. SOLUTION: A plurality of blocks 5 are formed to be partitioned in a tread surface 2. In the block 5, a siping 6 connecting both side edges of the block 5 to extend in a direction crossing with a tire peripheral direction is formed. The siping 6 has an end part in both side edge sides of the block 5 and an intermediate part between the end parts. A groove width a1 of the siping 6 in the intermediate part is smaller than a groove width a2 of the siping in the end part, to satisfy an expression (1) 0.3(mm)<=a1(mm)<=0.8×a2(mm), (2) a2(mm)<=1.0(mm).
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