R11


Production Model Years
   1929 - 1934

Frame and Engine Numbers

   Frame numbers
    101 - 9891
    ———
   Engine numbers
    60001 - 73985

Model Specifications
Drivetrain
Displacement745cc
Cylinders2
Bore x Stroke (mm)78 x 78
HP @ RPM18 @ 3400 (Series I-IV)
20 @ 3400 (Series V - twin carburetor)
Compression Ratio5.5:1
ValvesSidevalve, 2 per cylinder
ClutchDry, dual plate, cable operated
Transmission3 speed, hand shifted
Final DriveDriveshaft
Running Gear
FramePressed steel, rivetted
Front SuspensionUndamped (friction damping beginning with Series IV), trailing link, leaf spring
Rear SuspensionRigid
Front Brakes200mm drum, single leading shoe
Rear BrakesContracting shoe drum on driveshaft, heel operated
Electrical
IgnitionBosch magneto (Battery/coil or magneto option on Series V)
Spark PlugsBosch W175
GeneratorBosch D2B L type magneto/generator, 6V 30/50W (Bosch B245 R generator, 6V 45/70W, standard, D2B R 6V 30/50W magneto/generator optional, on Series V)
Capacities & Measurements
Weight162kg
Fuel14l
Wheelbase1380mm
Top Speed112kph
Number Produced7500 (all Series)
With the purchase of the Dixi automobile works in Eisenach, Thuringia in 1928, BMW came into ownership of steel stamping machinery. This they put to use on the R11/[url=http://www.vintagebmw.org/v7/model/r16]R16[/url] models to eliminate the continuing problems with the old brazed tubular frames that had a tendency to crack, especially under hard sidecar usage. Motor numbers are arranged into the model years and "Series Numbers" as follows:
 Build Year  Series  Engine Numbers 
1929*I60001 - 63988
1930I63989 - 64500
1931II65001 - 66946
1932III67501 - 68920
1933IV69001 - 70122
1934V70123 - 73985
*) These motor numbers also correspond to the 1929 R62 engine numbers

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.