| 摘要 |
A pneumatic tire with improved steering stability without raising air columnar resonance noise is provided. The pneumatic tire comprises first oblong holes 11 having an opening portion of a trapezoidal shape that is elongated in the depth direction of a main groove 1 and whose depth D1 on the tread surface side is shallower than a depth D2 on the groove bottom side and second oblong holes 12 having an opening portion of a trapezoidal shape that is elongated in the depth direction of the main groove and whose depth D4 on the groove bottom side is shallower than a depth D3 on the tread surface side, wherein number of the first oblong holes 11 is 50 to 100% of the sum of oblong holes 11 and 12, the depths D2 and D3 are at least not less than 0.5 mm and 0.05 to 0.3 times a width W of the main groove 1, the depths D1, D4 are not greater than 0.1 times a depth D of the main groove 1, widths w of the oblong holes 11, 12 are at least not less than 0.5 mm and 0.05 to 0.2 times the width W of the main groove 1, and heights H of the oblong holes 11, 12 in the depth direction of the main groove are 50 to 80% of the depth D of the main groove 1. |
