| MODEL | BSA C10 250 1938 - 1957 |
| Year | 1938 - 1957 |
| Engine Type | Four stroke, single cylinder, 2 side valves |
| Displacement / Capacity | 249 cc / 15.2 cu in |
| Bore X Stroke | — |
| Compression Ratio | — |
| Cooling System | Air cooled |
| Max Power | 9 kW / 12 hp |
| Max Torque | — |
| Ignition | Coil |
| Induction | — |
| Start System | Kick start |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 3-Speed, hand change (foot change on the de Luxe from 1939) |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Diamond |
| Front Suspension | Girder, damped forks |
| Rear Suspension | None, spring-loaded saddle |
| Front Brakes | 7 in drum |
| Rear Brakes | 7 in drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 113 kg / 250 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | 3.1 L/100 km / 75 mpg |
| Top Speed | 88.5 km/h / 55 mph |
The C10 opened BSA's C range of lightweight four-strokes in 1938 as a simple 249 cc sidevalve single with coil ignition and a hand-change three-speed box. A foot-change de Luxe followed in 1939 alongside the overhead-valve C11. It was an economical commuter and saw heavy military use around the outbreak of war.
