| 摘要 |
PROBLEM TO BE SOLVED: To generate large cornering power and improve braking performance. SOLUTION: Four circumferential grooves 2, 3 continuously extending to the circumferential direction are provided on a tread surface 1, and the number of pitches over whole circumference of the shoulder block rows 12 which are partitioned further outside from respective shoulder circumferential grooves 3 positioned at the most outside in the width direction is made to be not more than 80. The number of sipes 13, 14 provided on the land row partitioned at the tread surface part 1 is made to be 1 to 5 per one pitch of the shoulder block rows 12. The length of sipe per one pitch length of the shoulder block row 12 is made to be longer than that of the shoulder block row 12 at the center rib 4 and the second block row 8, and the ratio of the curvature radius (CR<SB>1</SB>) of the center rib 4 at the area sandwiching tire equatorial plane EP relative to the curvature radius (CR<SB>2</SB>) of the same at the area straddling the shoulder block row 12 from the second block row 8 is made to be less than 1 in the cross section in the width direction of the tire. COPYRIGHT: (C)2007,JPO&INPIT |
