| 摘要 |
A speed-changing device for a bicycle, which comprises a control device having a control lever, a derailleur comprising a fitting member, a four member linkage mechanism having a chain guide and a return spring, and a control wire, said control device having a first positioning mechanism for positioning the chain guide only during returning motion of said chain guide by said return spring, said derailleur having a second positioning mechanism for positioning of said chain guide only during forward motion of said chain guide through a pulling operation of said wire.
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