R4


Production Model Years
   1932 - 1937

Frame and Engine Numbers

   Frame numbers
    1001 - 10437
    80001 - 97700
    ———
   Engine numbers
    80001 - 95280

Model Specifications
Drivetrain
Displacement398cc
Cylinders1
Bore x Stroke (mm)78 x 84
HP @ RPM12 @ 3500
Compression Ratio5.7:1
ValvesOHV, 2 per cylinder
ClutchDry, single plate, cable operated
Transmission3 speed, hand shifted
Final DriveDriveshaft
Running Gear
FramePressed steel, rivetted
Front SuspensionUndamped, trailing link, leaf spring
Rear SuspensionRigid
Front Brakes180mm drum, single leading shoe
Rear Brakes180mm drum, single leading shoe, heel operated
Electrical
IgnitionBattery/coil
Spark PlugsBosch W175
GeneratorBosch generator, 6V 45W
Capacities & Measurements
Weight137kg
Fuel12l
Wheelbase1300mm
Top Speed100kph
Number Produced15295
Chassis serial numbers for the R4 had a preceding P as well.

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.