| BSA M20 | 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 | |
| 496 cm3 | - |
| Bore X Stroke | |
| 3.2x3.7 in OR 81 mm | - |
| Compression Ratio | |
| 4.9:1 | - |
| Horsepower | |
| 13/4200 KW(hp)/RPM | 48/- KW(hp)/RPM |
| Fuel System | |
| Amal carburetor | - |
| transmission specs | |
| Gearbox | |
|---|---|
| 4-speed, manual | - |
| Clutch | |
| dry, multi-plate | - |
| Final Drive | |
| chain | - |
| chassis specs | |
| Frame | |
|---|---|
| steel | Aluminium frame |
| Front Suspension | |
| parallelogram fork | - |
| Rear Suspension | |
| hard-tail, sprung seat | - |
| Front Brake | |
| drum | - |
| Rear Brake | |
| drum | - |
| dimension specs | |
| Overall Length | |
|---|---|
| 85.8 in OR 2179 mm | - |
| Overall Width | |
| 29.1 in OR 739 mm | - |
| Seat Height | |
| 28.5 in OR 724 mm | - |
| Ground Clearance | |
| 4.7 in OR 119 mm | - |
| Weight | |
| 368 lbs OR 167 kg | 351 lbs OR 159 kg |
| Fuel Capacity | |
| 3.7 gallons OR 14.0 L | - |
| Wheelbase | |
| 54 in OR 1372 mm | - |
| tyres specs | |
| Front | |
|---|---|
| 3.25 x 19 | - |
| Rear | |
| 3.50 x 19 | - |
