Definition of derailleur
:a mechanism for shifting gears on a bicycle that operates by moving the chain from one set of exposed gears to another
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Superstar Peter Sagan stayed upright, but his chain jammed into his front derailleur and needed servicing.
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Though materials and build play a part in the Ajax’s silent operation, the main reasons are the 8-speed internal hub and belt drive at the heart of the bike’s derailleur-free drivetrain.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'derailleur.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of derailleur
French dérailleur, from dérailler
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