| 摘要 |
The derailleur comprises a chain guiding and shifting device in the form of a fork member (2) articulated to a support (1) adapted to be fixed to the frame of the bicycle. At least one (4) of the wings of the fork member (2) has a part (11) which is adjustable in position so as to adapt the width of the at least one wing (4) to the diameter of the small chain wheel of the crank-gear.
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