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R 39
. Data sheet
. Back to Models
Begin of the Production 1925
End of the Production 1927
Numbers Produced 855
Price 1.870,- RM
Internal Designation M 40
Motor Type four-stroke single-cylindervertical
Bore x Stroke 68 x 68 mm
Displacement 247 ccm
Max Power 6,5 hp at 4500 rpm
Compression Ratio 6.0 : 1
Valves ohv
Carburetion System 1 x carburettor BMW Spezial 20 mm
Engine Lubricating System forced-feed lubrication
Oil Pump gear pump
Power transmission
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
Ignition System Bosch magneto generator type G 1.8 V/15 W
Generator Bosch magneto ignition
Spark Plugs Bosch W 175
Designation R 39
Frame twin-loop tubular frame
Front Wheel Suspension plate spring, 4 laminae
Rear Wheel Suspension rigid
Wheel Rims 27 x 3.5 type CC I
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 brake (drum brake) Ø 150 mm
Brakes rear external shoe brake at the gearing (on cardan shaft)
Dimensions / Weights
Length x Width x Height 2050 x 800 x 950 mm
Fuel Tank Capacity 10 l
Unladen Weight, Full Tank 110 kg
Fuel Consumption approx. 2,5 l/100 km
Oil Consumption approx. 1-2 l/1000 km
Top Speed 100 kph
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