| 摘要 |
There is provided a pneumatic radial tire for motorcycle which improves a feeling of rigidity without sacrificing the various performances of the tire such as a linear traveling performance, a high speed performance, ride comfort, a weight, uniformity, and the like and enhances a turn steering performance in high speed cornering. The pneumatic radial tire for motorcycle includes a carcass layer composed of a carcass ply 12 and a spiral belt layer 26 composed of steel cords wound spirally substantially in parallel with each other to a tire equator surface. When the ratio of spacing R1 between adjacent steel cords of the spiral belt layer 26 is shown by R1 = (50 - E x ds)/50,
the ratio of spacing R1 is 0.45 or less as well as the total sectional area S of the steel cords applied per 50 mm width of the spiral belt layer is 7.5 mm 2 or less (E shows the number of steel cords applied per 50 mm width of the spiral belt layer, and ds shows the diameter (mm) of the circumscribed circle of each steel cord). |
