| 摘要 |
<p>A pneumatic radial tire which has a reduced weight and reduced rolling resistance which are achieved by controlling the deformation of the tire without a reduction in the durability of belt layers. A pneumatic radial tire satisfying the relationships of Vfb = 0.63 and 0.29 = Vfp = 0.33, where Vfb is the amount of steel per unit width of belt layers (3a, 3b, 3c) and is expressed by Vfb = Db/(Db + Wb) (with Db being the diameter of steel cords of the belt layers (3a, 3b, 3c) and Wb being the distance between adjacent steel cords in the belt layers (3a, 3b, 3c)), and Vfp is the amount of steel per unit width of a carcass ply (2) and is expressed by Vfp = Dp/(Dp + Wp) (with Dp being the diameter of steel cords of the carcass ply (2) and Wp being the distance between adjacent steel cords in the carcass ply (2)).</p> |
