| 摘要 |
PROBLEM TO BE SOLVED: To improve remarkably abrasion resistance by making a siping exhibit its original function fully. SOLUTION: A lap grooves 2, 3 are provided to the tread part 1, each curved siping 7, 8, of which one end opens at each side edge and another end finishes in the land part, is formed in the land part 4 located closest to the tread center C-C, is formed shifting a phase in the circumferential direction. A tangent drawn to each curved siping 7, 8 is orthogonalized the land part center line and crossed the land part side edge at an acute angle. Notch parts 11, 12 are provided in the corner part of the acute angle side land part 9, 10 which are sectioned by the lap groove 2 and the curved sipings 7, 8. |
