| 摘要 |
A hub rotatably engaged on a rear wheel axle of a multi-speed bicycle, a cone disposed on each end of the rear wheel axle, a bearing rotatably engaged between one end of the body and one of the cones, a barrel formed integral on the other end of the body and extended outward toward the other cone, another bearing rotatably engaged between the barrel and the other cone, whereby, the bearings are rotatably engaged on the ends of the rear wheel axle such that the rear wheel axle is stably supported in place.
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