| 摘要 |
PURPOSE:To restrain biased abrasion and to drastically delay development of one side dropped abrasion. CONSTITUTION:A pair of narrow grooves 16 is provided on a tread 12, a first circular arc part 12A is provided between a tread center CL and the narrow grooves 16 and a second circular arc part 12B is provided between the narrow grooves 16 and a tread edge part 12C. Consequently, a grounding shape 26 of a pneumatic radial tire 10 for heavy load at the time of loading comes to be gradually shorter in grounding length from the center in the tire cross direction toward both edge parts in the tire cross direction and comes to be longer in the grounding length in the circumferential direction toward the both edge parts in the tire cross direction again. Accordingly, drag at the tread edge part 12C is drastically reduced, biased abrasion is restrained and development of one side dropped abrasion is drastically delayed. |
