Production Model Years
1925 - 1926
Frame and Engine Numbers
8000 - 8900 / 36000 - 36900
Model Specifications
Displacement 247cc
Cylinders 1
Bore x Stroke (mm) 68 x 68
HP @ RPM 6.5 @ 4000
Compression Ratio 6.0:1
Valves OHV, 2 per cylinder
Clutch Dry, single plate, cable operated
Transmission 3 speed, hand shifted
Final Drive Driveshaft
Running Gear
Frame Tubular double loop, brazed
Front Suspension Undamped, trailing link, dual leaf spring
Rear Suspension Rigid
Front Brakes 150mm drum, single leading shoe
Rear Brakes Contracting shoes on driveshaft mounted drum, heel operated
Ignition Bosch magneto
Spark Plugs Bosch M175
Generator Bosch magneto/generator, 6V
Capacities & Measurements
Weight 110kg
Fuel 10l
Wheelbase 1410mm
Top Speed 100kph
Number Produced 900

BMW's first single.

In order to attract buyers at the lower end of the price scale, BMW introduced the R39 single. Unfortunately, design problems with the single piece upper crankcase half/cylinder, which was alloy and had a shrunk in iron liner, meant that BMW had to remove the bike from the market after a short run.


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