| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire which improves wandering resistance and prevent the wearing-off of a tread. SOLUTION: The pneumatic tire has at least a plurality of vertical grooves G extending in the direction of the tire circumference and lined up horizontally in the direction of the tire axis, and shoulder blocks which are demarcated by horizontal grooves g crossing the vertical groove G and are lined up circumferentially along the tread edge. A thin groove F is formed at the inside relative to the tread edge in the axial direction on each shoulder block, the thin groove having a width equal to 0.5% to 3.0% of a tread width TW and a depth from the tread surface equal to 30 to 80% of that of the outer vertical groove G demarcating the shoulder block at the tire equator side. The thin groove F virtually divides the shoulder block into a main portion at the tire equator side and a thin land outside the main portion, and is curved convexly at a radius of curvature equal to 30 to 70% of the tread width TW in length toward the outside in the axial direction on the tread surface. The tread surface of the thin land is cut out to make its top surface closer to the tire axis than the tread surface is, thereby forming a stepped shape between the main portion and the thin land. COPYRIGHT: (C)2004,JPO |
