1928 BMW R57
| Engine Engine type Bore x Stroke Displacement Valves Compression ratio Max Power Max Torque Fuel system Transmission Final drive Clutch Ignition type Starting system Lubrication Exhaust Spark plug Battery Gear ratios | Air-cooled, 4-stroke, Four-stroke two cylinder flat twin 68.0 x 68.0 mm (2.67 x 2.67 inches) 494 cc OHV 5.8:1 18 hp @ 4000 rpm 1 carburettor, Type BMW Spezial two valve 24 mm 3-speed (foot shifting) Cardan Single plate, dry - two plates from engine No. 70889 Bosch high voltage magneto ignition Kick starter Forced feed lubrication Bosch W 175 6 volt 12 amp hour |
| Dimensions Frame type Castor Overall length Overall width Overall height Wheelbase Seat height Ground clearance Dry weight Fuel capacity Colors Suspension (front) Suspension (rear) Tyre (front) Tyre (rear) Brake (front) Brake (rear) | Twin loop steel tubular frame 2100 mm (82.67 inches) 800 mm (31.49 inches) 950 mm (37.40 inches) 1400mm (55.11 inches) 850 mm (33.50 inches) 165 mm (6.49 inches) 150 kg 12.5 litres Plate spring, 6 laminae Rigid 26 x 3.5 low pressure or 26 x 3.5 high pressure 26 x 3.5 low pressure or 26 x 3.5 high pressure Drum brake 200 mm / 7.87 in diameter External shoe brake at the gearing on Cardan shaft |
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