| 摘要 |
Steering stability and drainage property are improved in good balance. A center land portion 5 is formed between crown circumferential grooves 3i, 3o which are located on inner side and outer side of a vehicle and extend in the circumferential direction on both sides of the tire equator. In the center land portion 5 are disposed a plurality of curved oblique grooves 8 each of which extends obliquely toward the inner side of the vehicle across the tire equator from its outer end 8a opening at the outer crown circumferential groove 3o, turns toward the outer side of the vehicle, and further extends obliquely up to its inner end 8b located in the center land portion 5, and the respective curved oblique grooves 8 are connected with each other through connecting groove portions 11 each extending in the circumferential direction from the inner end 8b. In the center land portion 5 is disposed a center rib 5a which is defined by the connecting groove portions 11, portions of the curved oblique grooves 8 each portion extending between the connecting groove portions 11, and the inner crown circumferential groove 3i, and which extends continuously in the circumferential direction while repeating increase and decrease of its axial width, and the ratio of maximum width to minimum width of the center rib 5a is 2.0 to 4.0.
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