| 摘要 |
PURPOSE:To make one-sided wear prevention and long time high-speed running both attainable, by forming a zigzag pitch and a deflection range of each ridgeline, facing a main groove consisting of a shoulder rib and a second rib, in a small extent toward the outside in a tread width direction. CONSTITUTION:Each of zigzag pitches P53, P52 and P42 and deflection ranges W53, W52 and W42 of a ridgeline 42 facing a main groove 2 at an inside end of a shoulder rib 4 in a tread width direction, a ridgeline 52 facing the main groove 2 at an outside end of a second rib 5 in the same direction and a ridgeline 53 facing a main groove 3 at an inside end of the rib 5 is made smaller by degrees toward the outer side of tread width. With this constitution, wavy wear in the shoulder rib 4 is prevented from occurring and, what is more, rail way wear in and around the ridgeline 52 is preventable. In addition, improvements in wet capacity is well promotable. |
