Patent ID: 9162531
Filing Date: 2015-10-20
Classification: B60C

Abstract:
1. A motorcycle tire including a tread portion having a designated rotation direction, comprising the tread portion having a tread surface between a first tread edge and a second tread edge while curving in a convex arc-like manner and a tread width which is an axial distance between the first and second tread edges being a maximum tire width, and the tread portion being provided with a plurality of inner inclined grooves and a plurality of inclined narrow grooves, each said inner inclined groove extending from an axially inner end to an axially outer end toward an opposite direction to the designated rotation direction and having an angle of from 0 to 20 degrees with respect to a circumferential direction of the tire, and the axially inner end of the inner inclined groove located in a developed length within 5% of a tread half developed-width from a tire equator, said inner inclined grooves comprising a plurality of first inner inclined grooves circumferentially arranged at first pitches and each having the axially outer end toward the first tread edge and a plurality of second inner inclined grooves circumferentially arranged at second pitches and each having the axially outer end toward the second tread edge, and said first inner inclined grooves and said second inner inclined grooves alternately arranged in the circumferential direction of the tire, said each first inner inclined groove having a circumferential length of from 70 to 85% of first pitches, and said each second inner inclined groove having a circumferential length of from 70 to 85% of second pitches, said each inclined narrow groove provided between circumferentially adjacent inner inclined grooves in both sides of the tire equator, the inclined narrow groove having a groove width of from 0.5 to 2.0 mm, the inclined narrow groove extending an axially inner end to an axially outer end toward the opposite direction to the designated rotation direction and having an angle with respect to a circumferential direction of the tire larger than that of the inner inclined groove, and the axially inner end of the inclined narrow groove located in a developed length within 10% of the tread half developed-width, the axially outer end of the inclined narrow groove located outside a crown portion which comes into contact on a ground under a normally inflated loaded condition that the tire is mounted on a standard wheel rim and inflated to a standard pressure and loaded with a standard tire load at a camber angle of zero, and a land ratio of the crown portion of from 85 to 95%.