Patent Number: 8,714,218

Title: Pneumatic tire with tread having rib portion, sub-grooves and sipes

Abstract: A pneumatic tire is configured such that: paired first main grooves extending in a tire circumferential direction are provided on the two 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; multiple 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; 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 satisfies 1.1.times.P.ltoreq.L.ltoreq.2.0.times.P.

Inventors: Ebiko; Masahiro (Kanagawa, JP)

Assignee: The Yokohama Rubber Co., Ltd.

International Classification: B60C 11/03 (20060101); B60C 11/12 (20060101)

Expiration Date: 5/06/12018