| 摘要 |
PROBLEM TO BE SOLVED: To be compatible with both the wet performance and pattern noise by setting the angle of inclination of inclined main grooves against the circumferential direction of a tire in a specified range, and changing the amount relation between the angle of inclination of block treading end side groove wall surface and the angle of inclination of block kick out end side groove wall surface of the inclined main groove in both sides of an auxiliary groove as a boundary line. SOLUTION: Each inclined main groove 14 is extended with the angle of inclination at 15-45 deg. against the circumferential direction of a tire in a tread intermediate area TM, and extended with the angle of inclination at 75-105 deg. against the circumferential direction of the tire near the end of a tread end E and opened at a narrow width, and circularly extended at the end 14B, which is extended in the tread center area TC, and opened to the adjacent inclined main groove. Since the shape of the inclined main groove matches the movement of water in the tread operating surface, excellent draining performance is obtained. Angle of inclination of the groove wall surface in the block treading end side is set smaller than that of the block kick-out end side in the inclined main groove 14 between the tire equatorial surface CL and an auxiliary groove 18, and the angle of inclination of the groove wall surface is reversely set in an area between the auxiliary groove 18 and the tread end E so as to restrain the uneven abrasion. |
