| 摘要 |
In a rear derailleur of the type including an articulated parallelogram joint, the axes of articulation of the two connecting rods of the articulated parallelogram to the upper body of the derailleur are inclined to the longitudinal plane of the bicycle in the position of mounting of the derailleur on the bicycle. These axes are also arranged with one outwardly of and higher than the other so that the plane containing them is also inclined to the axis of the rear wheel of the bicycle. It is possible to arrange for the lower body of the derailleur to be displaced when the chain is derailed, the chain transmission wheel being kept at a substantially constant distance from the sprocket which is engaged by the chain from time to time.
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