| 摘要 |
A pneumatic radial tire for heavy load is provided in which a tread design formed on the tread portion is divided into a tread part Ab with larger ground contact area ratio and a tread part Aa with smaller ground contact area ratio with the tread equator plane as a boundary, the ratio Sa/Sb of a ground contact area ratio Sa of the tread part Aa to a ground contact area ratio Sb of the tread part Ab is set in a range of 0.71 through 0.89, and the tread part Aa with smaller ground contact area ratio is located on the inner side of a vehicle when the tire is mounted thereon. Whereby, abnormal wears, such as one-sided wear or shoulder wear, occurred in the tread portion of the tire mounted to, particularly, a steering wheel can be alleviated so as to improve wear resistance of the tread portion and hence to prolong the service life of the tire remarkably.
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