PNEUMATIC TIRE

摘要

PURPOSE:To improve the draining efficiency of a tire and various wet performance by setting the radius of an approximate circular arc on the grounding front end line of a tire tread at the specific relation to the grounding width. CONSTITUTION:Multiple main grooves extended in the peripheral direction of a tire and multiple lateral grooves extended to intersect these main grooves are formed on a tire tread 14 respectively. Main grooves are arranged in the directions of the normal line on a preset approximate circular arc 12. The approximate circular arc 12 is determined by a circular arc containing an intersection (a) between a center line 15 extended in the tire peripheral direction on the grounding width center of the tire tread 14 and the grounding front end line and intersections (b) and (c) between line segments 17 and 18 extended in the tire peripheral direction at positions separated to the right and left from the center line 15 by 40% of the grounding width (w) and the grounding front end line 16. The radius (r) of the approximate circular arc 12 is set at the relation r<=2w to the grounding width (w).