| 摘要 |
A radial tyre for motorcycles comprises a carcass (6) extending between bead portions (4) through a tread portion (2) and sidewall portions (3), and a belt (7) disposed radially outside the carcass (6) in the tread portion (2) and comprising two crossed breaker plies (7A,7B) of cords laid at angles of from 16 to 26 degrees with respect to the tyre equator. The method of making the radial tyre comprises vulcanising the tyre in a mould (20) which applies a variable stretch (S) to the belt during vulcanising the tyre, wherein the stretch (Sc) at the tyre equator is in a range of from 6.0 to 7.0%, and the stretch gradually decreases from the tyre equator to the axial edges (BE) of the belt. The stretch is defined as (BD2/BD1-1)X100 wherein BD1 is the inside diameter of the belt (7) before tyre vulcanisation, and BD2 is the inside diameter of the belt (7) during tyre vulcanisation. <IMAGE> |
