derailleur
UK /ˌdəˈɹeɪl.jə/ US /ˌdəˈɹeɪ.lɚ/
noun 2
Definitions
noun
1
The mechanism on a bicycle used to move the chain from one sprocket (gear) to another.
The common rear derailleur designs all operate on the same principle. A moveable cage receives the chain returning from the chainwheel and directs it onto one sprocket of the cluster.
2
The entire gearset on a bicycle with such a mechanism.
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