| 摘要 |
PROBLEM TO BE SOLVED: To improve control stability and abrasion resistance by a shape of an acute cross portion at which two tread grooves acutely cross. SOLUTION: An inclined cross portion 5 is provided at an acute cross portion 3 where two tread grooves Gy and Gm acutely cross. The inclined cross portion 5 is formed by excising an acute cross portion 3 with an inclined surface 4 starting at a tread face 2 and extending in an inclined radial direction to reach and terminate near 2 cross portion P of groove bottoms Bm and By of the two tread grooves Gy and Gm. The inclined surface 4 consists of a convex curved surface 4S protruding outwards in a radial direction. |
