| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent uneven wear by providing an uneven wear sacrificing part having a level difference with respect to the sectional contour line of a tread being held between land parts, a level difference region independent of the land parts and slide-contacted with a road surface within a tread grounding region. SOLUTION: In a heavy load pneumatic tire having a main groove 1 and land parts 2 on a tread of a tire, a level difference is formed with respect to the sectional contour line of the tread being held between the land parts 2 and a level difference region 3 independent of the land parts 2 is provided. Its surface is made to be an uneven wear sacrificing part slide-contacted with a road surface within a tread grounding region for supporting a load applied to the tire. In this case, preferably, for the uneven wear sacrificing part, a ratio between the grounding length of the level difference region 3 along the outer periphery of the tread under a load of up to 200% and a grounding length in the shorter grounding area of the land part 2 adjacent to the level difference region 3 is set to 0.95 or lower. Also, the total sum of the axial direction width of the level difference region 3 is set to 5 to 25% of a tread grounding width and each axial direction width (w) of the level difference region 3 is set to 1/2 of each axial direction width of the land part 2. |
