| 摘要 |
In a tyre and wheel assembly the wheel rim tyre engagement zones each comprise a tyre bead retaining flange (5), a tyre bead seat (6) and an abutment region (8) which projects radially outwards of the bead seat (6), and the tyre beads each contain a substantially inextensible circumferentially extending bead reinforcement (2), and each have, when considered in radial cross-section in the inflated condition on the wheel rim, an effective size (11) measured in the inward radial direction of the assembly from the centre of the reinforcement (2) such that the tyre bead contacts the bead seat and is prevented from inward movement by the abutment (8) and a smaller effective size (10) measured from the centre of the annular reinforcement (2) in an axial, e.g. axially outward, direction, the smaller effective size (10) being less than the difference in radii between the annular reinforcement (2) and the radial extremity of the abutment (8) such that the tyre bead may, having been rotated so that the smaller effective size (10) extends radially, be passed over the abutment to its seat (6) for tyre fitting. <IMAGE>
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