| 摘要 |
PURPOSE:To restrain an occurrence of partial wear over the entire duration of service of a tire by specifying the width of cut of a plurality of sipe parts to the groove depth and to the groove width of main grooves partitioning a rib respectively. CONSTITUTION:In a tire 10, a plurality of main grooves 14 extended in the circumferential direction of the tire in a zigzag shape on its tread surface 12 are formed so as to be separated from each other in the width direction of the tire, so that a plurality of ribs 16 extended in the circumferential direction of the tire and separated by respective main grooves 14 so as to be apart from each other in the width direction of the tire are partitioned. And a plurality of sipes 20 extended in the width direction of the tire and also separated from each other in the circumferential direction are provided. In this case, the width Wa of cut of the sipe part 20a up to a depth d of 0.2 to 0.8 times the groove depth D of the main groove 14 that has been measured from the tread surface 12 towards the turning axis direction of the tire is set to be 0.15 to 0.75 times the groove width W of the main groove 14. On the other hand, the width Wb of cut of the sipe part 20b exceeding the depth d is set to be 0.25 to 1.0 times the groove width of the main groove 14. |
