| 摘要 |
PURPOSE: To enhance hydro-plaining performance and to lower the noise at the same time, while steering stability in a dry running enhanced and wear resistance of the tire is maintained. CONSTITUTION: A tread part 2 is provided with four circumferential grooves, i.e., a pair of inner circumferential grooves 3 and a pair of outer circumferential grooves 4, both of which are continuous in the circumferential direction. An intermediate rib 10A situated on the inside between the inner and outer circumferential grooves, both of which are located on the inside when the tire is mounted on a vehicle, is given such a height as an idle gap G can be ensured between the rib 10A and the road surface. In addition, a distance L between a groove edge of the inner circumferential groove (holding this intermediate rib with the outer circumferential groove therebetween) on the equator C side and a groove edge on the tread E side of the outer circumferential groove should be not less than 40mm and moreover the distance L should be 1/3 the ground contact width. |
