| BMW R51 | APRILIA RS 457 |
|---|
| engine specs | |
| Type | |
|---|---|
| air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylinder | liquid-cooled twin-cylinder engine with dual camshaft timing and four valves per cylinder |
| Displacement | |
| 494 cm3 | - |
| Bore X Stroke | |
| 2.7x2.7 in OR 69 mm | - |
| Compression Ratio | |
| 6.7:1 | - |
| Horsepower | |
| 24/5600 KW(hp)/RPM | 48/- KW(hp)/RPM |
| Fuel System | |
| 2xAmal carburetors | - |
| transmission specs | |
| Gearbox | |
|---|---|
| 4-speed, manual | - |
| Clutch | |
| dry, single plate | - |
| Final Drive | |
| shaft | - |
| chassis specs | |
| Frame | |
|---|---|
| steel | Aluminium frame |
| Front Suspension | |
| telescopic fork | - |
| Rear Suspension | |
| long swing arm with suspension units and oil pressure shock absorbers | - |
| Front Brake | |
| 200mm drum | - |
| Rear Brake | |
| 200mm drum | - |
| dimension specs | |
| Overall Length | |
|---|---|
| 83.85 in OR 2130 mm | - |
| Overall Width | |
| 32 in OR 813 mm | - |
| Weight | |
| 401 lbs OR 182 kg | 351 lbs OR 159 kg |
| Fuel Capacity | |
| 3.69 gallons OR 14.0 L | - |
| Wheelbase | |
| 55 in OR 1397 mm | - |
| tyres specs | |
| Front | |
|---|---|
| 3.5x19 | - |
| Rear | |
| 3.5x19 | - |
