If you like our site, please consider joining our club!
By joining you will help ensure that we can continue to provide this service
JOIN HERE!
R12
Model Documentation
- R12 Owners handbook (English language) (published 1935) (18.4 MB)
- R12 Owners handbook (German language) (published 1935) (12.3 MB)
- R12 Owners handbook (English language) (published 1936) (6.3 MB)
- R12 Owners handbook (German language) (published 1937) (22.8 MB)
- R12 Owners handbook (German language) (published 1939) (6.8 MB)
- R12 Owners handbook (German language) (published 1942) (17.5 MB)
- R12 parts manual (German language) (published 1935) (11.6 MB)
- R12 parts manual (German language) (published 1936) (16.3 MB)
- R12 parts manual (German language) (published 1937) (12.8 MB)
- R12 parts manual (German language) (published 1938) (7.7 MB)
- R12 parts manual (German language) (published 1940) (10.5 MB)
- R12 parts manual (German language) (published 1941) (13.2 MB)
- R12 parts manual (German language) (published 1941) (14.2 MB)
- R12 parts manual (German language) (published 1942) (14.6 MB)
- 1936 BMW Catalog of models (English language) (published 1936) (3.0 MB)
- 1936 BMW Catalog of models (German language) (published 1936) (4.2 MB)
- 1937 Full Line Catalog (German language) (published 1937) (1.5 MB)
- R12 Technical Data and Information (English language) (3.0 KB)
- R12 Full Technical Data (English language) (114.5 KB)
- R12 Technical specifications (single carb) (English language) (published 1976) (1.0 MB)
- R12 Technical specifications (dual carb) (English language) (published 1976) (1.0 MB)
- 1935 R12 Advertisement (English language) (published 1935) (889.0 KB)
- 1935 R12 Advertisement (English language) (published 1935) (1.8 MB)
- R12 Production Numbers by Date (German language) (246.6 KB)
- Bosch D2B manual document (English language) (1.2 MB)
- Bosch B142-245 Manual (German language) (1.4 MB)
- Bosch B245 Spares document (German language) (655.3 KB)
- R12 Production numbers graph (German language) (70.7 KB)
- R12 Side view picture from manual (German language) (170.4 KB)
- A wonderful document on the Magdynamo (German language) (6.0 MB)
- Bosch D2B Component image (Multiple language) (279.1 KB)
- A wonderful document on the Magdynamo (English language) (51.8 MB)
- R12 Fork Leg diagram (122.7 KB)
- R12 Fork Parts image (361.2 KB)
- Suspension writeup from Peter Ardron (English language) (50.4 KB)
Model Specifications | |
|---|---|
| Drivetrain | |
| Displacement | 745cc |
| Cylinders | 2 |
| Bore x Stroke (mm) | 78 x 78 |
| HP @ RPM | 18 @ 3400 (single Sum carburetor), 20 @ 3400 (twin Amal carburetors) |
| Compression Ratio | 5.2:1 |
| Valves | Sidevalve, 2 per cylinder |
| Clutch | Dry, dual plate, cable operated |
| Transmission | 4 speed, hand shifted |
| Final Drive | Driveshaft |
| Running Gear | |
| Frame | Pressed steel, rivetted |
| Front Suspension | Hydraulically damped telescopic fork |
| Rear Suspension | Rigid |
| Front Brakes | 200mm drum, single leading shoe |
| Rear Brakes | 200mm drum, single leading shoe, heel operated |
| Electrical | |
| Ignition | Bosch magneto (Battery/coil default on civilian models, magneto optional; magneto on all military models) |
| Spark Plugs | Bosch W175T1 |
| Generator | Bosch B245 RS108 generator, 6V 45/70W, standard on civilian models, D2B R 6V 30/50W magneto/generator optional on civilian and standard on military models |
| Capacities & Measurements | |
| Weight | 185kg |
| Fuel | 14l |
| Wheelbase | 1380mm |
| Top Speed | 110kph early; 120kph late |
| Number Produced | 36000 |
First production hydraulically damped telescopic forks. Second range of frame and engine numbers matched when they left the factory. First BMW with front and rear wheels exchangeable.
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.