Radial tire for motorcycle with two part bead apex

Details Radial tire for motorcycle with two part bead apex Radial tire for motorcycle with two part bead apex

1994-03-29

1995-07-04

Johnstone, Adrienne

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152526, 152527, 152530, 152531, 152533, 152541, 152546, 152547, 152554, 152555, B60C 304, B60C 922, B60C 1506

Patent

active

054291690

ABSTRACT:
A radial tire for motorcycle has a belt layer of cords with modulus of elasticity of 600 kg/mm.sup.2 or more wound spirally on a carcass nearly parallel to the tire equator, and a bead apex rubber disposed on a bead core between a carcass main portion extending from a tread to a bead core and a carcass turned up portion. The bead apex rubber consists of a soft apex part SA with JISA hardness of 50 to 60 degrees extending radially outward from the bead core, and a hard apex part HA with JISA hardness of 70 to 95 degrees extending radially outward from the soft apex part SA. A height h1 the soft apex part SA from a bead base is 0.20 to 0.40 times a height h0 of the tread end, and a height h2 of the hard apex part HA is 0.50 to 1.25 times the height h0 of the tread end.

REFERENCES:
patent: 4120338 (1978-10-01), Mirtain
patent: 4962803 (1990-10-01), Welter
patent: 5198051 (1993-03-01), Suzuki et al.
patent: 5234043 (1993-08-01), Suzuki et al.
Patent Abstracts of Japan, vol. 16, No. 44 (M-1207) 4 Feb. 1992 & JP-A-03 248 903.

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