| 摘要 |
A pneumatic tire 1 which includes a plurality of rib-shaped land portions extending in a tire-circumferential-direction and in which a circumferential groove is formed extending in the tire-circumferential-direction between the land portions. The circumferential groove is provided with an intra-groove groove formed to recess inwardly in a tire-radial-direction from the circumferential groove while having its upper ends at a groove bottom of the circumferential groove. Paired inner wall surface and outer wall surface forming the intra-groove groove each continuously extend in tire-circumferential-direction while meandering in tread-width-direction. The intra-groove groove includes a wide groove portion in which a groove width of the intra-groove groove in tread-width-direction is a predetermined width; and a narrow groove portion which is continuous with the wide groove portion and which has a narrower width than the predetermined width. The wide groove portion and the narrow groove portion are alternately provided in tire-circumferential-direction. |
