BMW R 57 (1928-30)
Comparison technical specifications
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| Make: | BMW |
| Model: | R 57 |
| Years: | 1928-30 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. |
| Capacity: | 494 cc / 30.1 cu in. |
| Bore x Stroke: | 68 x 68 mm |
| Compression Ratio: | 5.8:1 |
| Induction: | 1 x Spezial two valve ∅24 mm carburetor |
| Ignition: | Bosch high voltage magneto ignition |
| Starting: | Kick |
| Clutch: | Single plate, dry |
| Max Power: | 13.4 kW / 18 hp @ 4000 rpm |
| Transmission: | 3 Speed |
| Final Drive: | Shaft |
| Gear Ratio: | 1st 2.83 / 2nd 1.55 / 3rd 1.08 |
| Frame: | Twin loop steel tubular frame |
| Front Suspension: | Plate spring, 6 laminae |
| Rear Suspension: | Rigid |
| Front Brakes: | ∅200mm Drum |
| Rear Brakes: | Block brake |
| Front Tyre: | 26 x 3.5" low pressure or 26 x 3.5" high pressure |
| Rear Tyre: | 26 x 3.5" low pressure or 26 x 3.5" high pressure |
| Wet-Weight: | 150 kg / 330 lb |
| Fuel Capacity: | 12.5 liters / 3.3 US gal |