derailleurnoun [ C ]
/dɪˈreɪl.jer//dɪˈreɪ.lɚ/specializeda type of bicycle gear that works by moving the bicycle chain from one sprocket wheel (= a wheel with a row of tooth-like parts) to another:
Set the rear derailleur in the lowest gear, with the chain on the biggest sprocket wheel at the back.
derailleur gears
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Bicycles
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