| MODEL | BSA C15 250 1958 - 1967 |
| Year | 1958 - 1967 |
| Engine Type | Four stroke, single cylinder, OHV |
| Displacement / Capacity | 249 cc / 15.2 cu in |
| Bore X Stroke | 67 x 70 mm |
| Compression Ratio | 8.0:1 (C15SS 8.75:1) |
| Cooling System | Air cooled |
| Max Power | 11 kW / 15 hp |
| Max Torque | — |
| Ignition | — |
| Induction | Amal carburettor |
| Start System | Kick start |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4-Speed |
| Clutch | 4 friction plates |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Single loop with twin rails under engine |
| Front Suspension | Telescopic, 127 mm / 5 in travel |
| Rear Suspension | Pivoted fork, 63 mm / 2.5 in travel |
| Front Brakes | 6.5 in drum |
| Rear Brakes | 6.5 in drum |
| DIMENSION SPECS | |
| Overall Length | 1981 mm / 78.0 in |
| Overall Width | 660 mm / 26 in |
| Overall Height | 940 mm / 37 in |
| Seat Height | 762 mm / 30 in |
| Wheelbase | 1308 mm / 51.5 in |
| Ground Clearance | 127 mm / 5 in |
| Dry Weight | 127 kg / 280 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25 x 17 in |
| Rear Tyre | 3.25 x 17 in |
| FUEL SYSTEM | |
| Fuel Capacity | 11.5 Litres / 3.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The C15 arrived in 1958 as BSA's first unit-construction four-stroke, bringing engine and gearbox together in one casting. Cheap and light, it became a staple learner and trials/scrambles base through the 1960s, spawning C15T, C15S and C15SS variants. It was replaced in 1967 by the B25 Starfire and C25 Barracuda.
