| 摘要 |
<p>An all-season pneumatic radial tire has a block pattern in a tread defined by two circumferential main grooves (1) and slant grooves, in which the two circumferential main grooves are arranged on either side of the tread with respect to a pattern center to divide the tread into a central region (TC) and side regions (TS). In this tire, the slant grooves are comprised of steep slant groove segments (2) and gentle slant groove segments (3), and the steep slant groove segments (2) are disposed in the central region (TC) and the gentle slant groove segments (3) are disposed in both side regions (TS) of the tread in a herringbone directional tread pattern designating a rotating direction (RD) of the tire to be mounted onto a vehicle. A surface of an acute corner angle zone of each of the blocks (4) defined by the circumferential main grooves (1) and the steep slant groove segments (2) and arranged in the central region (TC) of the tread is chamfered over a distance of 10-30 mm from a taper end in a longitudinal direction so as to gradually shallow from the taper end toward a thickened zone. <IMAGE></p> |
