A quick survey of 211 machines taking part in a TCF ride on 13th April 1924 at L’Etang-la Ville, near Paris, showed:

• 28 pure single speeds.
• 72 double fixed set ups.
• 31 with hub gears.
• 3 with geared chainwheel systems.
• 15 with floating chains.

and

• 62 with derailleur systems.

The 62 derailleur systems included 7 examples of 2 X 4 speed systems, 24 examples of 2 X 3 speed systems, 7 four speed systems, 22 three speed systems and 2 two speed systems.

Strangely the sample includes 6 Hirondelle models - but the analysis does not seem to include any retro-direct transmissions.

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

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• Publisher: T.C.F. Revue Mensuelle
• Country: France
• Date: June 1924
• Derailleur brands: Audouard, Boizot, BSA, Peugeot, Terrot
• Derailleurs: none named