Pneumatic radial tires for motorcycles

Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube

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Details

152554, 152555, 152560, B60C 908, B60C 1506

Patent

active

047734639

ABSTRACT:
A pneumatic radial tire for motorcycle is disclosed, which comprises a tread, a pair of sidewalls, a carcass composed of at least one rubberized ply containing organic fiber cords arranged in a direction of approximately 90.degree. with respect to the equatorial plane of the tire, and a belt disposed between said tread and said carcass at a width corresponding to a tread width and composed of at least two rubberized plies each containing cords with a modulus of elasticity of at least 600 kg/mm.sup.2 arranged at an inclination angle of 15.degree.-30.degree. with respect to the equatorial plane of the tire. In the tire, each end of the carcass is wrapped around a bead ring embedded in each radially inner end portion of the sidewalls toward a direction of the tread to form a turnup portion; a tapered rubber filler extending from an upper part of the bead ring toward the tread direction and having a Shore A hardness of at least 60.degree., and at least one cord reinforcing layer extending upward from a position near the bead ring along the turnup portion and having an inclination cord angle of 15.degree.-30.degree. with respect to the circumferential direction of the tire are disposed between the carcass and the turnup portion thereof or outside the turnup portion; and at least one of radial heights extending from the bead base to ends in the tread direction of the rubber filler, cord reinforcing layer and turnup portion corresponds to at least 60% of the radial height of the sidewall.

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Yoshida et al., "Stability and Steering Response in Two-Wheeled Vehicle", Journal of Automotive Soc. of Japan, vol. 26, 1972, pp. 866-872.
Kageyama, "Brake Tire", Series of Automobile Engineering, No. 12, pp. 45-48.
Takahashi et al., "Influence of Tires on Straight Running Motorcycle Weave Response", SAE Tech. Paper Series 840248.

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