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Start of Production |
1928 |
Click to View |
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End of Production |
1929 |
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Numbers Produced |
4,377 |
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Price |
1,510 RM |
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Engine |
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Internal Designation |
M 57 |
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Motor Type |
Four-stroke two cylinder flat twin |
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Bore x Stroke |
63 x 78 mm (2.48 x 3.07 in) |
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Displacement |
486 cc |
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Max Power |
12 hp at 3,400 rpm |
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Compression Ratio |
5.0 : 1 |
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Valves |
SV |
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Carburation System |
1 carburettor, Type BMW Spezial 2 valve 22 mm |
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Engine Lubricating System |
Forced feed lubrication |
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Oil Pump |
Gear pump |
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Power Transmission |
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Clutch |
Single plate, dry - two plates from engine No. 50761 |
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Number of Gears |
3 |
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Shifting |
Manual |
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Gearbox Ratios |
2.83 / 1.55 / 1.08 |
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Rear Wheel Ratio |
1 : 4.38 or 1 : 4.75 (1 : 5.7 with sidecar) |
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Bevel/Crownwheel |
13 / 57 teeth or12 / 57 (10 / 57 with sidecar) |
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Electrical System |
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Ignition System |
Bosch high voltage magneto ignition |
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Generator |
Bosch magneto generator on request |
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Spark Plugs |
Bosch W 175 |
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Chassis |
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Designation |
F56 |
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Frame |
Twin loop steel tubular frame |
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Front wheel suspension |
Plate spring, 6 laminae |
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Rear wheel suspension |
Rigid |
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Wheel rims |
Deep bed 19x 3 |
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Tyres, Front |
26 x 3.5 low pressure or 26 x 3.5 high pressure |
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Tyres, Rear |
26 x 3.5 low pressure or 26 x 3.5 high pressure |
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Brakes, Front |
Drum brake 200 mm / 7.87 in diameter |
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Brakes, Rear |
External shoe brake at the gearing on Cardan shaft |
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Dimensions/Weights |
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Length x Width x Height |
2100 x 800 x 950 mm (82.67 x 31.49 x 37.40 in) |
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Wheel Base |
1400 mm / 55.11 in |
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Fuel Tank Capacity |
12.5 litres / 2.74 gal / 3.30 gal US |
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Unladen Weight with Full Tank |
152 Kg / 334 lb |
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Load Rating |
210 Kg / 462 lb |
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Fuel Consumption |
3.5 litres 100 Km approx / 80 mpg / 67 mpg US |
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Oil Consumption |
1 - 2 litres per 1,000 Km approx. |
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Top Speed |
100 Kph / 62 mph |
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