| BMW R 39 | APRILIA RS 457 |
|---|
| engine specs | |
| Type | |
|---|---|
| air-cooled, four-stroke, single vertical cylinder, OHV | liquid-cooled twin-cylinder engine with dual camshaft timing and four valves per cylinder |
| Displacement | |
| 247 cm3 | - |
| Bore X Stroke | |
| 2.67x2.67 in OR 68 mm | - |
| Compression Ratio | |
| 6:1 | - |
| Horsepower | |
| 6/4000 KW(hp)/RPM | 48/- KW(hp)/RPM |
| Fuel System | |
| 1x20mm BMW Spezial | - |
| transmission specs | |
| Gearbox | |
|---|---|
| 3 speed, manual | - |
| Clutch | |
| dry, single plate | - |
| Final Drive | |
| shaft | - |
| chassis specs | |
| Frame | |
|---|---|
| steel | Aluminium frame |
| Front Suspension | |
| plate spring, 4 laminae | - |
| Rear Suspension | |
| hard-tail, sprung seat | - |
| Front Brake | |
| 150mm drum | - |
| Rear Brake | |
| external shoe brake at the gearing (on cardan shaft) | - |
| dimension specs | |
| Overall Length | |
|---|---|
| 80 in OR 2032 mm | - |
| Overall Width | |
| 31 in OR 787 mm | - |
| Weight | |
| 242 lbs OR 110 kg | 351 lbs OR 159 kg |
| Fuel Capacity | |
| 2.64 gallons OR 10.0 L | - |
| tyres specs | |
| Front | |
|---|---|
| 27 x 3.5 | - |
| Rear | |
| 27 x 3.5 | - |
