Patent ID: 8881778
Filing Date: 2014-11-11
Classification: B60C,Y02T

Abstract:
1. A motorcycle tire comprising: a tread portion with a tread surface extending between tread edges and curved in an arc-like shape to have a radially outwardly convex profile in the transverse cross section of the tread portion, the tread portion provided in the tread surface with main grooves and sub-grooves, wherein given a crown region centered on the tire equator and ranging 33% of a tread development width, a pair of shoulder regions each ranging 17% of the tread development width from each tread edge, and a pair of middle regions between the crown region and the shoulder regions, each said main groove has a main part extending from its inner end positioned on one side of the tire equator in the crown region to its outer end positioned in the shoulder region on the other side of the tire equator, said main grooves are first main grooves and second main grooves arranged alternately in the tire circumferential direction, wherein the main parts of the first main grooves extend in a circumferential direction to one of the shoulder regions, the main parts of the second main grooves extend in the same circumferential direction to the other shoulder region, and the main parts each intersect the tire equator at an angle of 0 to 15 degrees, three sub-grooves are disposed between every two of the circumferentially adjacent main parts of the main grooves, extend from an inner end positioned in one of the middle regions to an outer end positioned in the adjacent shoulder region, are inclined in the same direction as the adjacent main parts, and include a shorter sub-groove and a longer sub-groove, and wherein the main grooves and the sub-grooves define a land ratio Lc of the crown region, a land ratio Lm of the middle regions and a land ratio Ls of the shoulder regions, which satisfy the relationship: Lc<Lm<Ls.