Patent ID: 8714218
Filing Date: 2014-05-06
Classification: B60C

Abstract:
1. A pneumatic tire characterized in that paired first main grooves extending in a tire circumferential direction are provided on both sides of a tire equator line in a tread portion, respectively, a distance between a center position of each first main groove and the tire equator line is set at 8% to 20% of a ground contact width W, a first land portion is defined between these first main grooves, a plurality of sub-grooves each having a curved shape are formed in each of both edge portions of the first land portion at intervals in the tire circumferential direction, one end of each sub-groove is opened to the corresponding first main groove, and the other end of the sub-groove is terminated inside the first land portion, wherein a plurality of sipes extending in a tire width direction, each sipe being connected to both of the corresponding sub-groove and the first main groove, are provided between each sub-groove in the first land portion and the first main groove, a rib portion continuously extending in the tire circumferential direction is formed in an area of the first land portion on the tire equator line, and a relation between a length L of a center line of each sub-groove and a pitch length P of the sub-grooves in the tire circumferential direction is set to satisfy 1.1×P≦L≦2.0×P.