Patent ID: 8434535
Filing Date: 2013-05-07
Classification: B60C

Abstract:
1. A pneumatic tire in which a plurality of circumferential main grooves that extend in the tire circumferential direction are formed in a tread surface portion, and a plurality of land portion rows are partitioned by the circumferential main grooves, wherein in at least one of the plurality of the land portion rows a circumferential auxiliary groove extending in the tire circumferential direction and having a narrower width and shallower depth than those of the circumferential main grooves is formed in a position avoiding the tire centerline, among both side faces defining the circumferential auxiliary groove, one side face on the tire centerline side extends along the normal direction of the tread surface portion or is inclined to the tire centerline side by 5° or less with respect to the normal direction, and the other side face on the side opposite to the tire centerline side is inclined to the side opposite to the tire centerline side by 10° to 30° with respect to the normal direction, the incline of the other side face of the circumferential auxiliary groove extending continuously from a bottom face of the circumferential auxiliary groove to the tread surface portion, and an inclination angle of each side face of the circumferential main grooves is the same.