R39
Start of Production | 1925 |
Click to View Available Literature |
End of Production | 1927 | |
Numbers Produced | 855 | |
Price | 1,870 RM | |
Engine |
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Internal Designation | M 40 | |
Motor Type | Four-stroke single cylinder vertical | |
Bore x Stroke | 68 x 68 mm (2.67 x 2.67 in) | |
Displacement | 247 cc | |
Max Power | 6.5 hp at 4,000 rpm | |
Compression Ratio | 6.0 : 1 | |
Valves | OHV | |
Carburation System | 1 carburettor Type BMW Spezial 20 mm | |
Engine Lubricating System | Forced feed lubrication | |
Oil Pump | Gear pump | |
Power Transmission |
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Clutch | Single plate, dry | |
Number of Gears | 3 | |
Shifting | Manual | |
Gearbox Ratios | 6 / 9.28 / 13.7 | |
Rear Wheel Ratio | 1 : 2.84 | |
Bevel/Crownwheel | 14 / 37 teeth | |
Electrical System |
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Ignition System | Bosch magneto generator type G 1.8V/15W | |
Generator | Bosch magneto ignition | |
Spark Plugs | Bosch W 175 | |
Chassis |
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Designation | R39 | |
Frame | Twin loop tubular frame | |
Front wheel suspension | Plate spring, 4 laminae | |
Rear wheel suspension | Rigid | |
Wheel rims | 27 x 3.5 type CC 1 | |
Tyres, Front | 27 x 3.5 balloon or with 26 x 3 high pressure tyres | |
Tyres, Rear | 27 x 3.5 balloon or with 26 x 3 high pressure tyres | |
Brakes, Front | Internal shoe drum brake 150 mm / 5.90 in diameter | |
Brakes, Rear | External shoe brake at the gearing on Cardan shaft | |
Dimensions / Weights |
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Length x Width x Height | 2050 x 800 x 950 mm (80.70 x 31.49 x 37.40 in) | |
Fuel Tank Capacity | 10 litres / 2.19 gal / 2.64 gal US | |
Unladen Weight with Full Tank | 110 Kg / 242 lb | |
Fuel Consumption | Approx. 2.5 litres per 100 Km / 113 mpg / 94 mpg US | |
Oil Consumption | Approx. 1 - 2 litres per 1,000 Km | |
Top Speed | 100 Kph / 62 mph | |
Information kindly supplied by P.Hawksley