| 摘要 |
There is provided a pneumatic radial tire for a motorcycle whose turning stability is improved by achieving both grounding performance and lateral rigidity at high level. A mono-spiral belt (MSB) ( 3 ) includes steel cords whose tensile break strength is 5.9 Pa or more. A value Tc of a number of driven cords in the MSB (per 25 mm in width) at an equator of the tire and a value Ts at shoulder parts thereof meet requirements of 17<=Tc<=24 and 0.6<=Ts/Tc<=0.9. A disposed width BW of the MSB meets a requirement of 0.6<=BW/TW<=1.0. At least one textile-reinforcing layer having tensile break strength of 5.9 Pa or more is disposed at both ends of the MSB while overlapping with the MSB. An overlap of the MSB with the textile-reinforcing layer is 4 to 10 times of the diameter D of the steel cords in the MSB.
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