| 摘要 |
PURPOSE:To reduce the amount of projection of a tread surface when a vehicle runs at very high speed so as to uniform ground pressure at very high speed and enhance stability in controlling the vehicle and resistance to localized abrasion of the tire by changing the initial modulus of a belt layer from place to place, the belt layer being disposed between a carcass and a tread. CONSTITUTION:The tread of a tire is partitioned into two lines of longitudinal block groups located on both sides and four lines of longitudinal block groups on the whole surface by two pairs of right and left circumferential grooves 1a, 1b and a number of lateral grooves 2a, 2b connecting the circumferential grooves 1a, 1b together and the circumferential groove 1b to a tread end T. A belt layer 8 is formed by a main belt layer 8a and an auxiliary belt layer 8b, the main belt layer 8a comprising belt layers each of which has nonexpensive cords arranged at small angles to the equatorial plane of the tire and at least two of which are laid one over the other and arranged in such a way that the cords cross each other. The amount by which a ribbon-shaped ply overlaps the auxiliary belt layer 8b is larger in areas B, C corresponding to the longitudinal block groups 3 than in an area A corresponding to the circumferential grooves 1a, 1b. |
