The Le Cyclo derailleur is effective against gradients, mud and headwinds (mud is an interesting addition to the usual suspects). It is available in 2 and 3 speeds and can be fitted in a few minutes.

(Source gallica.bnf.fr/ Bibliothèque nationale de France)

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: March 1929
• Derailleur brands: Cyclo
• Derailleurs: Le Cyclo 2 speed, Le Cyclo 3 speed