derailleur

Noun

Meaning

The mechanism on a bicycle used to move the chain from one sprocket (gear) to another.

The entire gearset on a bicycle with such a mechanism.

Synonyms

Examples

BSA continued to innovate introducing the 4 Star derailleur gear in 1949 Berto, Frank J. et al. Source: Internet

The derailleur design was altered from 1950 BSA Cycles Ltd, June 1950 Bicycle Catalogue It's Time You Had a BSA Birmingham Small Arms Company Ltd, no ISBN and was certainly available up to 1953 but was not a great success. Source: Internet

The bike has a gearbox, which replaces the standard derailleur found on most bikes. Source: Internet

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