Patent ID: 9643457
Date: 2017-05-09
CPC Classifications: B60C

Claim:
1. A pneumatic tire comprising: a tread portion provided with a center main groove disposed on the tire equator and a shoulder main groove disposed on each side of the center main groove, wherein the center main groove and the shoulder main groove extend zigzag and continuously in the tire circumferential direction so that a crown land portion defined between the center main groove and the shoulder main groove has an axial width alternately increasing and decreasing along the tire circumferential direction, wherein the crown land portion is provided with a single shallow crown circumferential groove having a depth less than a depth of the center main groove and extending zigzag and continuously in the tire circumferential direction, and a plurality of crown sipes extending from the center main groove to the shoulder main groove across the shallow crown circumferential groove, wherein the shallow crown circumferential groove is made up of first groove segments and second groove segments which are alternately arranged in the tire circumferential direction and inclined with respect to the tire circumferential direction reversely to each other, and the first groove segments and the second groove segments have substantially same circumferential lengths, wherein the first groove segments and the second groove segments form zigzag apexes, wherein each crown sipe has a V-shaped configuration having a single bent position, and each crown sipe is made up of an inside part on the axially inside of the bent position and an outside part on the axially outside of the bent position, which are inclined with respect to the tire axial direction reversely to each other, and wherein one of the zigzag apexes of the shallow crown circumferential groove is disposed between every two of the circumferentially adjacent crown sipes.