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derailleur

   Also found in: Wikipedia 0.01 sec.
de·rail·leur  (d-rlr)
n.
A device for shifting gears on a bicycle by moving the chain between sprocket wheels of different sizes.

[French dérailleur, from dérailler, to derail; see derail.]

derailleur [dəˈreɪljə]
n
(Engineering / Mechanical Engineering) a mechanism for changing gear on bicycles, consisting of a device that lifts the driving chain from one sprocket wheel to another of different size
[French dérailleur derailer]
Translations
derailleur [dəˈreɪljəʳ] n derailleur gears npl (Cycling) → deragliatore m


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The mountain bike also has a bike crank and derailleur; the crank is the part of the bike which is attached to the chain rings and makes the bike move, whereas the derailleur is what shifts the chain from one to the other.
Disc brakes front and rear do the stopping, and the transmission's an eight-speed Shimano derailleur job, so you still have to contend with an oily chain.
Wiggins then suffered disaster as he neared the end of the climb on the circuit, trying to fix an apparent problem with his front derailleur before getting off his bike and chucking it to the ground in disgust.
 
 
 
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