Patent ID: 9290058
Filing Date: 2016-03-22
CPC Classification: B60C

Claim Text:
1. A pneumatic tire comprising a tread portion, a carcass comprising at least one carcass ply of cords extending between bead cores in each bead portion through the tread portion and a pair of sidewall portions, and a belt comprising at least one belt ply of belt cords arranged on the axially outward of the carcass in the tread portion, wherein the tread portion is provided with a center circumferential main groove extending on a tire equatorial plane, a pair of shoulder circumferential main grooves arranged on axial outside of the center circumferential main groove, a plurality of center lateral grooves extending from the center circumferential main groove to the shoulder circumferential main grooves and a plurality of shoulder lateral grooves extending from the shoulder circumferential main grooves to at least tread edges, the center lateral grooves are inclined to the reverse direction of the belt cords of the outermost belt ply arranged on the radially outermost side of the belt ply of the belt, with respect to the tire circumferential direction, groove width Wyc of the center lateral grooves is from 1.0 to 6.0 mm, the shoulder lateral grooves are inclined to the same direction of the belt cords of the outermost belt ply, with respect to the tire circumferential direction, and the shoulder lateral groove comprises a narrow-width portion having a groove width Wys a wide-width portion having a groove width Wys a plurality of center blocks are divided by the center circumferential main groove, the shoulder circumferential main grooves, and the center lateral grooves, each center block is provided with a center sipe which extends from the shoulder circumferential main groove in an axially inward direction of the tire and in the same direction as the center lateral grooves, the center sipe has an axially inner end terminating within the center block, the center sipe has an angle β with respect to the tire circumferential direction gradually increasing axially outwardly, and the angle β at the axially inner end of the center sipe is smaller than a minimum value of an angle αc of the center lateral groove with respect to the tire circumferential direction.