| 摘要 |
PROBLEM TO BE SOLVED: To simultaneously achieve on-ice performance and on-snow performance.SOLUTION: A heavy load pneumatic tire includes, on a tread surface, a plurality of block rows arrayed in a tire circumferential direction, where a plurality of circumferential direction main grooves 22 extends in the tire circumferential direction, a plurality of lug grooves 24 extends in a direction intersecting the circumferential direction main grooves and disposed in the tire circumferential direction, and a plurality of block-shaped land parts 25 disposed in the tire circumferential direction. In at least one block row located in a region closer to the tire width direction inside than the circumferential direction main groove of the tire width direction outermost side, the first lug groove 24X of a groove wall angle α in a tire diameter direction and the second lug groove 24Y of a groove wall angle &bgr; in the tire diameter direction are respectively set within the range of the ground length of the tire circumferential direction in the ground region 26 of the tread surface. The groove wall angle α and the groove wall angle &bgr; satisfy α<&bgr; and 0[°]≤α≤6[°], the groove width Wx of the first lug groove and the groove depth H of the first lug groove satisfy 0.18≤Wx/H≤0.6, and the groove width Wx of the first lug groove and the groove width Wy of the second lug groove satisfy 1.0≤Wy/Wx≤1.5. |
