Patent ID: 6648040
Filing Date: 2003-11-18
Classification: B29C,B60C,Y10T

Abstract:
A method of making a radial tire for motorcycles,the radial tire comprising a carcass extending between bead portions through a tread portion and sidewall portions, a belt disposed radially outside the carcass in the tread portion, the belt composed of two or three plies including two cross breaker plies of cords laid at angles of from 16 to 26 degrees with respect to the tire equator, and the tread portion curved convexly so that the maximum tire section width lies between tread edges, the method comprising: vulcanizing the tire in a mold which causes a stretch to the belt during vulcanizing the tire, the stretch defined as (BD2/BD1âˆ’1)Ã—100 wherein BD1 is the inside diameter of the belt before tire vulcanization, and BD2 is the inside diameter of the belt during tire vulcanization, the stretch at the tire equator is in a range of from 6.0 to 7.0%, and the stretch gradually decreases from the tire equator to the axial edges of the belt.