Paul de Vivie proposes the, then radical, idea that different types of cycling require different numbers of, and ranges of, gears.

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

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: August 1909
• Derailleur brands: de Vivie
• Derailleurs: none