For 1951, BSA offered the following models:
D1 Bantam, Wico Pacy Electrics 125cc
D1 Bantam, Lucas Electrics 125cc
D1 Bantam Wico Pacy Electrics, Plunger 125cc
D1 Bantam Lucas Electrics, Plunger 125cc
D1 Bantam Wico Pacy Electrics, Plunger GPO 125cc
C10 250cc
C10 250cc Australia
C10 250cc, Plunger
C10 250cc, Plunger 4 Speed
C11 250cc
C11, Plunger 250cc
C11, Plunger 4 Speed 250cc
B31 350cc
B31 350cc, Plunger
B32 350cc Competition
B32 350cc Competition, Plunger
B32 350cc Competition Alloy Motor
B32 350cc Competition Alloy Motor, Plunger
B32GS 350cc Gold Star
B32GS 350cc Gold Star, Plunger
A7 500cc
A7 500cc, Plunger
A7S 500cc Star Twin, Plunger
B33 500cc
B33 500cc, Plunger
B34 500cc Competition
B34 500cc Competition, Plunger
B34 500cc Competition Alloy Motor, Rigid or Plunger
B34GS 500cc Gold Star
B34GS 500cc Gold Star, Plunger
M20 500cc
M20 500cc, Plunger
M33 500cc
M33 500cc, Plunger
M21 600cc, Rigid or Plunger
A10 650cc Golden Flash, Rigid or Plunger