Groupes et Accessoires pour Motocyclettes was founded in 1927 by Ribourt et Cie.
20 Rue Richard, St Etienne.
The firm built motorcycles branded Royal Sport and France Sport, which were all but identical. The France Sport was built for the René Bancal organisation, and the Royal Sport for Devaux of Paris.
G.A.M. built twin-loop cradle frames accepting various engines and gearboxes, fuel and oil tanks, wheels, brakes and forks.
In 1929, 10 different frames were available.
It is possible the B.J.S. marque used GAM frames.
Sources: Motos dans la Loire; moto-collection.org.
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