French Motorcycles

G.A.M. Frames

Founded 1927 by Ribourt et Cie

20 Rue Richard, St Etienne

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.  

Source: Motos dans la Loire

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Allen Motorcycle Museum
Allen Motorcycle Museum
Private museum in Boston, MA, with many highly collectable vintage motorcycles for sale.