| 摘要 |
A bicycle frame is cast in soft material, such as magnesium, and has at least one location 8 to receive a replaceable bearing. The location 8 is constituted by a replaceable steel sleeve 9 which is a push fit in the frame and is secured by adhesive which is strong enough to hold the sleeve 9 during normal operation but may be softened by heat (e.g. to 200 DEG ) to enable the sleeve 9 to be replaced when required. The sleeve 9 may have threads cut therein in the case of the crank bearing location illustrated, but in other cases, such as steering bearings, a smooth surface for a push fit may be more appropriate. <IMAGE> |
