| BMW R4 | APRILIA RS 457 |
|---|
| engine specs | |
| Type | |
|---|---|
| air-cooled, four-stroke, single vertical cylinder | liquid-cooled twin-cylinder engine with dual camshaft timing and four valves per cylinder |
| Displacement | |
| 498 cm3 | - |
| Bore X Stroke | |
| 3.3x3.1 in OR 84 mm | - |
| Compression Ratio | |
| 5.7:1 | - |
| Horsepower | |
| 12/4000 KW(hp)/RPM | 48/- KW(hp)/RPM |
| Fuel System | |
| carburetor | - |
| transmission specs | |
| Gearbox | |
|---|---|
| 3-speed, manual | - |
| Clutch | |
| dry, single plate | - |
| Final Drive | |
| shaft | - |
| chassis specs | |
| Frame | |
|---|---|
| steel | Aluminium frame |
| Front Suspension | |
| parallelogram fork | - |
| Rear Suspension | |
| hard-tail, sprung seat | - |
| Front Brake | |
| 160mm drum | - |
| Rear Brake | |
| 160mm drum | - |
| dimension specs | |
| Weight | |
|---|---|
| 302 lbs OR 137 kg | 351 lbs OR 159 kg |
| Fuel Capacity | |
| 3.2 gallons OR 12.1 L | - |
| tyres specs | |
| Front | |
|---|---|
| 3.50 x 26 | - |
| Rear | |
| 3.50 x 26 | - |
