Patent ID: 7921891

Claim:
A pneumatic tire for traveling on an off road, comprising a tread pattern in which a plurality of blocks are formed by at least three vertical grooves extending along a tire circumferential direction and a plurality of lateral grooves intersecting the vertical grooves, wherein each of the lateral grooves arranged among the three vertical grooves and the vertical groove arranged in a middle-most portion have a groove wall surface forming a step portion, and a projecting stripe continuing approximately at an identical height is provided at a whole of the middle-most vertical groove bottom and each lateral groove bottom thereof, wherein the projecting stripe continuing approximately at the identical height is provided in a periphery of the blocks by forming a projecting stripe at the groove bottom of each of the vertical grooves at both sides and wherein the groove depth of the lateral grooves is between 8 and 17 mm, the groove depth of the vertical grooves is between 8 and 17 mm, the height of the projecting stripe is equal to or more than 2.0 mm and equal to or less than 65% of the groove depth, the width of the projecting stripe is equal to or more than 2.0 mm based on an upper surface thereof and is equal to or less than 50% of the groove width based on an upper surface, and the projecting stripe is formed having a cross section with a flat top portion or a circular arc shaped top portion.