| 摘要 |
Protrusions 11 are provided in a buttress portion 20, the protrusions 11 are composed of a center portion 11a extending from the groove bottom 4 of the transverse grooves 2 toward the tire rotational axis and side portions 11b, the center portion 11a and the side portions 11b are integrally formed, the side portions 11b extend from the same cross-sectional height as, that of the center portion toward the tire rotational axis, the protrusions 11 extend at least to a virtual line 22 in which the inner most belt layer 21a is virtually extended to the buttress portion 20, and the width W of the side portions 11b is 7% to 30% of the depth D of the transverse grooves 2, and the thickness L of the protrusions 11 on the virtual line 22 is 1 mm to 10 mm. |
