| 摘要 |
PURPOSE:To prevent development of counter boring wear by thin grooves, and pebbles and the like from being clogged in the thin grooves by setting the positions of the thin grooves and belt width so that particular partial wear prevention effect index may be in a particular range. CONSTITUTION:In a tire, there are provided linear thin grooves 3 which continue in a tire peripheral direction in a range along the inside of the ground contacting ends of both shoulder parts under regular load, and the inside of a tire tread part 1 is reinforced by a belt layer 4. With the above constitution, the partial wear prevention index A of the thin grooves 3 which is obtained form the relation of the following formula; WS<2>/WB/WR=A for distance WS between the centers of respective thin grooves 3, average belt width WB and rim width WR is set so as to be in the range of 0.8-1.1. Besides, the groove width of the thin grooves 3 is set to 0.5-2% of tread part width WT, the groove depth is set to 50-120% of the depth of a main groove 2 which is the nearest to the thin grooves 3, and WS/WR is set to less than 1.00 and WT/WR to less than 1.05. |
