Solos and Combinations from Birmingham Small Arms
For 1931, BSA offered the following models:
B31-1 250cc 2.49 hp
B31-2 250cc OHV 2.49 hp
B31-3 250cc OHV 2.49 hp De Luxe
L31-5 250cc 2.49 hp Post Office
L31-4 350cc 3.49 hp
L31-5 350cc 3.49 hp De Luxe
L31-6 350cc OHV 3.49 hp De Luxe
S31-10 500cc OHV 4.93 hp De Luxe
S31-7 500cc 4.93 hp
S31-9 500cc OHV 4.93 hp
H31-8 550cc 5.57 hp DeLuxe
E31-11 750cc 7.70 hp Twin 2 Gallon Tank
E31-11 750cc 7.70 hp Twin 3 Gallon Tank
G31-12 1000cc 9.86 hp Twin World Tour
