 | |
| Manufacturer | Birmingham Small Arms Company |
|---|---|
| Production | 1937–1939 |
| Engine | 249cc single cylinder overhead valve 4 stroke |
| Transmission | 4 speed/chain |
| Fuel capacity | 3 gallons |
The BSA B21 was a British motorcycle made by Birmingham Small Arms Company (BSA) at their factory in Small Heath, Birmingham. Production started in 1937 and ended with the outbreak of World War II in 1939.