| 摘要 |
A connection tube of bicycle rear wheel hub includes a connection portion and an engaging portion one two ends of the connection tube, the connection portion is connected to the bicycle rear wheel hub. The engaging portion is a hollow tube and four elongate driving ribs extend radially from an outer periphery of the engaging portion. Each driving rib includes a driving surface and an inclined surface on two sides thereof. The driving surface is perpendicular to the outer periphery of the engaging portion. A positioning rib extends radially from an outer periphery of the engaging portion and is located between two driving ribs. Only the driving surface contacts the engaging ribs of the sprocket set.
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