This article needs additional citations for verification .(January 2013)  | 
|   | |
| Manufacturer | BSA | 
|---|---|
| Production | 1956-1958 | 
| Predecessor | BSA C11G | 
| Successor | BSA C15 | 
| Engine | 249cc OHV single-cylinder engine | 
| Power | 12 bhp | 
| Transmission | Duplex primary chain | 
The BSA C12 was a British pre-unit motorcycle manufactured by the Birmingham Small Arms Company from 1956 to 1958. [1]
The C12 used the same engine as the earlier C11G with the four-speed gearbox, but in a more modern chassis featuring a swinging arm rear suspension. [2] Minor engine modifications meant it was also far more reliable[ citation needed ].