| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise in a vehicle by reducing a higher-order component of a radial force variation and a tractive force variation. SOLUTION: In a pneumatic radial tire arranging a plurality of block lines 3b, 3c in which many blocks 5 are arranged in the circumferential direction of a tire on a tread surface 1, or a plurality of rib lines 3a in which many side grooves 4 are provided on a rib in the circumferential direction of the tire, the number of block lines or rib lines, having a cycle which is the minimum repetition unit in which a plurality of the blocks 5 or the side grooves 4 having a different pitch are continuously arranged, is made to differ each other every block line 3b, 3c, provided at least from the center to a shoulder end of one side, or rib line 3a. |
