Definition of derailleur in English:
A bicycle mechanism that moves the chain out and up, allowing it to shift to different cogs.
- The other side of the rollers will now contact the gears, and the derailleurs will now be laterally bending the chain the opposite direction.
- Then coat your bike's chain, derailleurs and pedals with a light lubricant.
- My front derailleur and chain rings were so full of mud I couldn't change gears, so I was stuck pedalling in the big chain ring.
1930s: from French, from dérailler 'derail'.
Definition of derailleur in:
- British & World English dictionary
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