| 摘要 |
A derailleur for a bicycle, in which a supporting member is supported movably to a fixing member and a change-over frame is fixed swingably to the supporting member through a first horizontal shaft. The derailleur is characterized in that a second tubular shaft is sleeved onto the first shaft coaxially therewith, a first pulley is supported rotatably to the second shaft, a tubular chamber is formed between the outer periphery of the first shaft and the inner periphery of the second shaft, and a coiled tension spring is housed within the chamber, thereby reducing the overall lateral width of the derailleur.
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