Patent ID: 9545825
Date: 2017-01-17
CPC Classifications: B60C

Claim:
1. A pneumatic tire comprising: a tread having, on a surface thereof, a plurality of circumferential grooves, which extend along a circumference of the tire, and shoulder land portions defined by shoulder grooves, which are circumferential grooves located in axially outermost positions of the circumferential grooves, wherein a groove wall surface located on the shoulder land portion side of the shoulder groove has a first inclined part, which is inclined toward an equatorial plane of the tire from a direction perpendicular to a tread face of the shoulder land portion, and a second inclined part, which is further inclined toward the equatorial plane from the first inclined part and reaches a bottom of the shoulder groove, wherein an inclination angle of the first inclined part is constant along the circumference of the tire and an angle α formed by the first inclined part and the second inclined part varies along the circumference of the tire, and wherein a maximum value α wherein the depth d satisfies 0.1<(d/D)<0.4, wherein the second inclined part has a plurality of groove-bottom sipes which are arranged along the circumference of the tire and open into the shoulder groove, wherein I and w satisfy 1.5<(I/w)<4 where w is a length of each groove-bottom sipe along the groove wall surface and I is an interval between an opening of a groove-bottom sipe and an opening of a groove-bottom sipe adjacent thereto along the circumference of the tire, and wherein the plurality of groove-bottom sipes is provided only in the second inclined part and wherein the shoulder land portions do not have land-portion sipes.