| 摘要 |
<p>A tyre comprises a carcass 30 turned-up around a bead core 42 and rubber apex strip 44, and an element 46 which is made of rubber having a higher modulus than the rubber of the apex strip 44 and which is placed on the outside of and in direct contact with the carcass turn-up 40 and an outer part of the apex strip 44. The element 46 may have a modulus at 20% extension >/=1.5 MPa and a Shore A hardness >/=75 DEG ,the corresponding properties of the apex strip 44 being approximately 0.65 MPa and 65 DEG . In the Fig. 2 construction the bead has a rubber cover layer 50 but this may be replaced by extension of the element 46. <IMAGE></p> |
