| 摘要 |
PROBLEM TO BE SOLVED: To improve the wear resistance at positions of circumferential grooves and the wear resistance as an entire tread by providing a pair of circumferential grooves continuous in the circumferential direction of the tread. SOLUTION: The depth Gh of each circumferential groove 2 is set to be 60-130 mm. An innermost belt layer is a steeply inclined belt layer (a) with the belt cord intersecting angle with respect to the equatorial plane EP of a tire in a range of 3-12°. The overlapping width Bw of the steeply inclined belt layer (a) and a belt layer (b) adjacent to an outer circumferential side thereof with the belt cords across each other between the layers is set to be 0.25-0.50 time the tread width Tw, and further equal to or more than the center-to-center distance Gw of the circumferential grooves. COPYRIGHT: (C)2004,JPO |
