| 摘要 |
<p>A motorcycle radial tyre comprising a pair of bead cores (5) disposed one in each bead portion (4), a carcass (6) extending between the bead portions (4) and turned up around the bead cores (5), said carcass (6) having at least one ply of cords arranged radially at an angle of 70 to 90 degrees with respect to the tyre equator (C), a belt (7) disposed radially outside the carcass (6) and inside a tread (2), and a bead apex (9) disposed between each turned up portion (6b) and the main portion (6a) of the carcass and extending radially outwardly one from each bead core (5), characterised in that the height (Ht) of the carcass turned up portions (6b) from the bead base line is more than 0.2 times and less than 0.5 times the height (Hs) of the tread edges (E1,E2) from the bead base line, said belt comprises a plurality of axially divided pieces (7a,7b,7c,7d,7e,7f), each belt piece being a spiral winding of a ribbon (10) of rubber in which at least one cord (11) is embedded, with a small inclination angle with respect to the tyre equator (C) in the same winding direction as the other belt piece or pieces (7a-7f), the height (Ha) of the radially outer edge of the bead apex (9) from the bead base line is more than 0.2 times and not more than 0.5 times said tread edge height (Hs). <IMAGE></p> |
