Patent ID: 7770619
Filing Date: 2010-08-10
Classification: B60C,Y10S

Abstract:
1. A pneumatic tire comprising: single first main grooves extending in tire circumferential directions and disposed respectively on right and left sides of a tire equator of a tread surface wherein the tread surface defines a tire-contact patch; and single second main grooves extending in the tire circumferential directions and disposed respectively on outer sides, in tire width directions, of the first main grooves, wherein lateral grooves extending between each pair of the first main grooves and the second main grooves as well as sub grooves extending halfway from the second main grooves toward the respective first main grooves are disposed one by one alternately with each other at predetermined pitches in the tire circumferential directions, blocks are formed each of which is defined by the first main groove, the second main groove and the lateral grooves, each of the left-side lateral grooves positioned on the left side of the tire equator on the tread surface region includes: the left-side sub grooves extend from the second main groove inwardly in the tire width direction while curving toward the one direction of the tire circumferential directions, and are set apart from the first groove portions LG the left-side sub grooves and the second groove portions LG each of the right-side lateral grooves positioned on the right side of the tire equator on the tread surface region includes: the right-side sub grooves extend from the second main groove inwardly in the tire width direction while curving toward the other direction of the tire circumferential directions, and are set apart from the first groove portions RG the right-side sub grooves and the second groove portions RG apertures at both ends of each of the lateral grooves are opened to the first main grooves and the second main grooves, respectively, and are shifted from one another in the tire circumferential directions, the left- and right-side lateral grooves are offset from each other in the tire circumferential directions, and the apertures of both the left- and right-side lateral grooves are shifted from one another in the tire circumferential directions and wherein each of the left-side sub grooves and the right-side sub grooves remain open in the tire-contact patch and each of the curving groove portions LG