BMW R 39
Number sold 855
Price 1.870,- RM
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| internal designation | M 40 |
| engine type | four-stroke vertical single cylinder engine |
| Bore/stroke | 68 x 68 mm |
| Cubic capacity | 247 cm3 |
| Max power | 6,5 PS at 4500 rpm |
| Compression ratio | 6,0 : 1 |
| Valves per cylinder | ohv |
| Carburation system | carburettor BMW Spezial 20 mm |
| Engine lubrication | forced-feed lubrication |
| oil pump | gear pump |
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| Power transmission | |
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| Clutch | single discs, dry |
| Number of gears | 3 |
| shifting | manual |
| Gear ratios | 6 / 9,28 / 13,7 |
| Rear wheel ratio | 1 : 2,64 |
| Bevel/crown wheel | 14 / 37 teeth |
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| Electrical system | |
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| Alternator | Bosch magneto ignition |
| Ignition | Bosch magneto generator Type G 1, 6 V /15 W |
| Spark plugs | Bosch W 175 |
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| Suspension | |
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| designation | R 39 |
| Type of frame | twin-loop tubular frame |
| Front suspension | plate spring, 4 laminae |
| Rear suspension | rigid |
| wheel rims | 27 x 3, 50 Typ CC 1 |
| Tyres front | 27 x 3, 50 balloon or with 26 x 3 high-pressure tyres |
| Tyres rear | 27 x 3, 50 balloon or with 26 x 3 high-pressure tyres |
| Brakes front | internal shoe brake (drum brake) Ø 150 mm |
| Brakes rear | external shoe brake at the gearing (on cardan shaft) |
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| Dimensions and weights | |
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| Length x width x height | 2050 x 800 x 950 mm |
| Tank capacity | 10 l |
| Unladen weight, full tank | 110 kg |
| Fuel consumption | ca. 2,5 l / 100 km |
| oil consumption | ca. 1 - 2 l / 1000 km |
| Top speed | 100 km/h |
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