| BSA B1 | APRILIA RS 457 |
|---|
| engine specs | |
| Type | |
|---|---|
| air-cooled, four-stroke, single cylinder, side valve | liquid-cooled twin-cylinder engine with dual camshaft timing and four valves per cylinder |
| Displacement | |
| 249 cm3 | - |
| Bore X Stroke | |
| 2.5x3.1 in OR 64 mm | - |
| Horsepower | |
| 2.5/3000 KW(hp)/RPM | 48/- KW(hp)/RPM |
| Fuel System | |
| Amal side float carburetor | - |
| transmission specs | |
| Gearbox | |
|---|---|
| 3-speed, manual | - |
| Clutch | |
| dry | - |
| Final Drive | |
| chain | - |
| chassis specs | |
| Frame | |
|---|---|
| steel | Aluminium frame |
| Front Suspension | |
| single spring girder fork | - |
| Rear Suspension | |
| hard-tail, sprung seat | - |
| Front Brake | |
| none | - |
| Rear Brake | |
| hand lever and foot pedal working independently on rear wheel dummy rim | - |
| dimension specs | |
| Weight | |
|---|---|
| - | 351 lbs OR 159 kg |
| tyres specs | |
| Front | |
|---|---|
| 2.75 x 19 | - |
| Rear | |
| 3.00 x 19 | - |
