| 摘要 |
PROBLEM TO BE SOLVED: To compatibly improve wet drainage performance and reduce tire noise at a high level. SOLUTION: Three circumferential grooves 2, 3 including a center circumferential groove 2, are provided, and steeply slanted grooves 6 which mutually extend in the reverse direction apart from a center circumferential groove 2, and an angle relative to the tread circumferential direction gradually increases toward a tread side edge side, are formed without opening to the center circumferential groove 2 on a tread central area 5. On that place, the groove width of the steeply slanted grooves 6 is gradually decreases toward the tread side edge side, respective steeply slanted grooves 6 are opened to the shoulder circumferential grooves 3, and two narrow auxiliary grooves 7 which communicate respective steeply slanted grooves 6 with the shoulder circumferential groove 3 are provided. Respective shoulder circumferential grooves 3 are extended in zigzag, and annular passage parts 4 linearly continuously extending to the tread circumferential direction, are provided. COPYRIGHT: (C)2005,JPO&NCIPI |
