R57


Production Model Years
   1928 - 1929

Frame and Engine Numbers

   Frame numbers
    20000 - 30600
    ———
   Engine numbers
    70001 - 71012

Model Specifications
Drivetrain
Displacement494cc
Cylinders2
Bore x Stroke (mm)68 x 68
HP @ RPM18 @ 3400
Compression Ratio5.8:1
ValvesOHV, 2 per cylinder
ClutchDry, single plate (dual plate from engine #70889), cable operated
Transmission3 speed, hand shifted
Final DriveDriveshaft
Running Gear
FrameTubular double loop, brazed
Front SuspensionUndamped, trailing link, leaf spring
Rear SuspensionRigid
Front Brakes200mm drum, single leading shoe
Rear BrakesContracting shoe drum on driveshaft, heel operated
Electrical
IgnitionBosch magneto
Spark PlugsBosch M175
GeneratorOptional Bosch D2 type magneto/generator, 6V 45W
Capacities & Measurements
Weight150kg
Fuel12.5l
Wheelbase1400mm
Top Speed115kph
Number Produced1005

The information provided here was obtained from a variety of public sources and may not reflect official BMW archival data.
Please contact the BMW Archives for official data regarding models.