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 Alcyon - 175 Type Bol d'Or
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Photo ou archives : F-M. Dumas

Capacity : 175
Model : Type Bol d'Or
Production : 1953 - 1954
Category : (R) Racing


175 AMC Bol d'Or – 1954

Track tribulations

It had been a long time since the kingfisher blue of the Alcyon ("kingfisher" in French) factory appeared on the race circuits, but the company was back on the track with some very special designs for the 1954 season.

Featherbed Frame

These had thoroughly modern cycle parts, with an Earles front fork and a frame inspired by the McCandless brothers' "Featherbed" design, a double cradle layout with robust steering head mounting; swing arm rear suspension was fitted. The Hat-bottomed tank sat on the upper frame tubes, and had lateral swellings that acted as elbow-rests for the rider. The wheels had light-alloy rims and the front one was braked by a double drum.

Molten Pistons

Powered by a heavily revised AMC overhead-valve 175cc "Bol d'Or" engine with shortened crankshaft and flywheel magneto with external coils, one of these machines took part in the Cote Lapize hillclimb in 1954. Two weeks later, in the "Two Hours of Montlhery" (the eliminating trials for the Bol d'Or), two of the works Alcyons were fitted with twin-cam 175 AMC engines developed by the rider/tuners Camus and Mathieu. They didn't last long: The pistons melted. Two other Alcyons, powered by overhead-valve AMC engines, finished eleventh and seventeenth. It seems as if AMC was concerned with preparing its road-going 250cc engine, which in the 1954 Bol d'Or was fitted in the Alcyon of L. Rouger/Robin and the "Featherbed" machine ridden by J. Rouger/Santucci. Only the standard machine completed the race, seventeenth out of twenty-nine.


Engine: 170cc (56x69mm) air-cooled single-cylinder four-stroke

Valves: overhead

Fuel System: 1 inch De!l'Orto carburettor

Transmission: 4-speed foot-shift, chain final drive

Suspension: Earles leading-links (front); swing arm (rear)

Brakes: twin drum (front); drum (rear)

Wheels: 2.50x19 inch wire (front & rear)

Maximum Speed: 78 mph

A tuned series-production engine, even in a well-conceived racing frame, does not necessarily make a successful competition bike - and the Alcyon Bol d'Or was far from successful.

Le fichier Moto Passion réalisé par François-Marie Dumas réunit près de deux mille photos accompagnées d'un historique très complet des machines présentées.
Il sera progressivement mis à jour ici et toute information complémentaire est la bienvenue sur info@moto-collection.org.

Cette documentation unique, qui constitue sans doute l'encyclopédie la plus exhaustive jamais écrite sur l'histoire de la moto, a été réalisée avec l'assistance de nombreux spécialistes dont principalement Didier Ganneau, Christophe Gaime, Mick Woollett, Jean Goyard, Bernard Salvat, Christian Rey, Yves Campion, Helmut Krackowizer, Michael Dregni, Michel Montange, etc. que je remercie ici.

Disponible sur demande :
- Les fiches originales sur papier
- Les photos et archives signées de mon nom en haute définition ou les documents originaux.
Me contacter sur info@moto-collection.org pour les conditions et droits d'utilisation.