| 摘要 |
PURPOSE:To improve performance on the ice and partial abrasion resistance by providing each side face which inclines at a specified angle in each of plural blocks of a tread, divided by plural grooves, and specifying the depth, angle, and interval of each sipe being formed in each block. CONSTITUTION:Zigzag circumferential main grooves 1A and 1B, linear circumferential sub grooves 2A and 2B, inclined coupling lateral grooves 3, and linear lateral groves 4 are arranged respectively in the treat T of a tire, whereby central blocks 6, shoulder blocks 7, and middle blocks 8 are divided, respectively. A cut (s) is formed individually in each block 6-8. In this case, each side face A-D, which inclines severally at an angle of 45-90 deg. to the tire equator face O-O, is provided in each block 6-8. Each cut (s) is formed in parallel at a depth of 1-7.5mm, at an angle of 35-90 deg. to each side face A-D, and at a mutual interval of 0.5d-1.5d+5/d. |
