| BSA B31 | APRILIA RS 457 |
|---|
| engine specs | |
| Type | |
|---|---|
| air-cooled, four-stroke, single cylinder, OHV | liquid-cooled twin-cylinder engine with dual camshaft timing and four valves per cylinder |
| Displacement | |
| 348 cm3 | - |
| Bore X Stroke | |
| 2.8x3.5 in OR 71 mm | - |
| Compression Ratio | |
| 6.5:1 | - |
| Horsepower | |
| - | 48/- KW(hp)/RPM |
| transmission specs | |
| Gearbox | |
|---|---|
| 4-speed, manual | - |
| Clutch | |
| multi-plate | - |
| Final Drive | |
| chain | - |
| chassis specs | |
| Frame | |
|---|---|
| steel | Aluminium frame |
| Front Suspension | |
| telescopic fork | - |
| Rear Suspension | |
| plunger shocks | - |
| Front Brake | |
| drum | - |
| Rear Brake | |
| drum | - |
| dimension specs | |
| Weight | |
|---|---|
| 386 lbs OR 175 kg | 351 lbs OR 159 kg |
| Fuel Capacity | |
| 5 gallons OR 18.9 L | - |
| tyres specs | |
| Front | |
|---|---|
| 3.25 x 19 | - |
| Rear | |
| 3.5 x 19 | - |
