Patent ID: 6935392

Claim:
A pneumatic tire comprising: a tread surface having a rotation direction of the tire designated in one direction; a straight main groove extending straight in a circumferential direction of the tire on a center of the tread surface; lateral grooves extending in a width direction of the tire from the straight main groove to both sides thereof and inclining toward a reverse rotation direction of the tire, the lateral grooves being arranged at predetermined pitch along the tire circumferential direction; blocks defined by said straight main groove and said lateral grooves; and left and right slant main grooves arranged at predetermined pitch long the tire circumferential direction on both sides of the straight main groove to cross three or more lateral grooves, the slant main grooves being inclined relative to the tire circumferential direction so that tire reverse rotation direction sides thereof are separated away from the straight main groove greater than tire rotation direction sides thereof, and one sipe extending from the tire rotation direction side end of each of said slant main grooves within a block in which the tire rotation direction side end is positioned, wherein both ends of the slant main grooves are positioned within the blocks, a groove width of each slant main groove is gradually widened from both end portions thereof toward a center portion thereof, an inclination angle of said slant main grooves relative to the tire circumferential direction is set in a range of 10 to 45°, and a maximum groove width thereof is set to be 80 to 110% of a groove width of said straight main groove.