Patent ID: 8069889

Claim:
A pneumatic tire with transverse grooves opened to the grounding edge and extending to the inner side in the tire width direction formed on a shoulder portion of a tread that is between a main groove extending in the tire circumferential direction and the grounding edge and provided with a row of blocks or a rib oil the shoulder portion, wherein the protrusions are provided in a buttress portion from the grounding edge to the position where the width becomes the maximum in the cross-section in the tire width direction, the protrusions axe composed of a center portion extending from the groove bottom of the transverse grooves toward the tire rotational axis and side portions that are on both sides of the center portion in the tire circumferential direction, and the enter portion and the side portions are integrally formed, the side portions extend from the position that is more of the tread side than the groove bottom toward the tire rotational axis, the protrusions extend at least to a virtual line in which the innermost belt layer is virtually extended to the buttress portion in the direction of the tire rotational axis, the width W of the side portions is 7% to 30% of D that is the depth of the transverse grooves, and L that is the thickness of the protrusions on the virtual line is 1 mm to 10 mm, wherein H that is the length of extension portions extended more to the tread side than the groove bottom of the side portions is not greater than 60% of D that is the depth of the transverse grooves.