Patent ID: 8511356

Claim:
A pneumatic tire with main grooves extending in the tire circumferential direction formed on a tread, wherein a sidewall of the main groove comprises first oblong holes each having an opening portion of a trapezoidal shape which is elongated in the depth direction of the main groove and whose depth D 1 on the tread surface side is shallower than a depth D 2 on the groove bottom side, and second oblong holes each having an opening portion of a trapezoidal shape which is elongated in the depth direction of the main groove and whose depth D 4 on the groove bottom side is shallower than a depth D 3 on the tread surface side, number of said first oblong holes is 50 to 100% of the sum of said first and second oblong holes, the depths D 2 and D 3 are at least not less than 0.5 mm and 0.05 to 0.3 times a width W of said main groove, the depths D 1 and D 4 are not greater than 0.1 times a depth D of said main groove, widths w of said first and said second oblong holes are at least not less than 0.5 mm and 0.05 to 0.2 times the width W of said main groove, heights H of said first and said second oblong holes in the depth direction of the main groove are 50 to 80% of the depth D of said main groove, and the trapezoidal shape of the first oblong holes and the trapezoidal shape of the second oblong holes are oppositely oriented.