| 摘要 |
A speed changing device is disclosed as comprising a base member fixed to a bicycle frame, mainly to a top tube, a pivot provided at the base member, a single control lever supported to the pivot rotatably therearound, first and a second independently rotatable winding bodies supported axially of the control lever, control wires for a front and a rear derailleur attached to the first and second winding bodies respectively, and coupling means comprising at least one retainer and a first and a second engaging portion in engagement with the retainer provided so as to couple the control lever selectively with one of the first and second winding bodies, thereby controlling the front and rear derailleurs by a single control lever.
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