Patent ID: 9227468
Filing Date: 2016-01-05
CPC Classification: B60C

Claim Text:
1. A motorcycle tire comprising a tread portion whose half region on each side of the tire equator is provided with main oblique grooves and auxiliary oblique grooves each not to protrude from the one half region to the other one half region, wherein the main oblique grooves on both sides of the tire equator are arranged circumferentially of the tire in a staggered manner, each of the auxiliary oblique grooves is disposed between the circumferentially adjacent main oblique grooves so as to incline in the same direction as the main oblique grooves, the axially inner end of each of the main oblique grooves is positioned at a first axial distance of 1 to 4 mm from the tire equator, the axially inner end of each of the auxiliary oblique grooves is positioned at a second axial distance from the tire equator which is more than the first axial distance, each of the main oblique grooves is composed of an axially inner linear part, an axially inner curved part, a middle linear part, an axially outer curved part, and an axially outer linear part, wherein the axially inner linear part extends substantially straight, axially outwardly from the axially inner end of the main oblique groove, while inclining at an angle of not more than 30 degrees with respect to the tire circumferential direction, the middle linear part is connected to the axially inner linear part through the axially inner curved part and extends substantially straight at an angle with respect to the tire circumferential direction, which angle is more than the angle of the axially inner linear part and in a range of from 25 to 70 degrees, and the axially outer linear part is connected to the middle linear part through the axially outer curved part and extends substantially straight at an angle with respect to the tire circumferential direction, which angle is less than the angle of the middle linear part and not more than 30 degrees, and each of the auxiliary oblique grooves is composed of an axially inner linear part, an axially inner curved part, a middle linear part, an axially outer curved part, and an axially outer linear part, wherein the axially inner linear part extends substantially straight, axially outwardly from the axially inner end of the auxiliary oblique grooves, while inclining at an angle of 25 to 55 degrees with respect to the tire circumferential direction, and the middle linear part is connected to the axially inner linear part through the axially inner curved part and extends substantially straight at an angle with respect to the tire circumferential direction, which angle is more than the angle of the axially inner linear part and in a range of from 45 to 75 degrees, and the axially outer linear part is connected to the middle linear part through the axially outer curved part and extends substantially straight at an angle with respect to the tire circumferential direction, which angle is less than the angle of the middle linear part and not more than 30 degrees.