| MODEL | BMW R 3 1936 |
| Year | 1936 |
| Engine Type | Four stroke, single cylinder vertical, 2 valves |
| Displacement / Capacity | 305 cc / 18.6 cu in |
| Bore X Stroke | 68 x 84 mm |
| Compression Ratio | 6.0:1 |
| Cooling System | Air cooled |
| Max Power | 8.2 kW / 11 hp @ 4200 rpm |
| Max Torque | — |
| Ignition | Battery ignition |
| Induction | 1 x Sum CK 3/500 carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4 Speed |
| Clutch | Single plate, dry |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | Pressed steel duplex frame |
| Front Suspension | Cantilever leaf spring (9 leaves) with friction damper |
| Rear Suspension | Rigid |
| Front Brakes | 200 mm drum |
| Rear Brakes | 200 mm drum |
| DIMENSION SPECS | |
| Overall Length | 1980 mm / 78.0 in |
| Overall Width | 850 mm / 33.5 in |
| Overall Height | 950 mm / 37.4 in |
| Seat Height | — |
| Wheelbase | 1320 mm / 52.0 in |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 149 kg / 328 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.50 x 26" balloon |
| Rear Tyre | 3.50 x 26" balloon |
| FUEL SYSTEM | |
| Fuel Capacity | 12 Litres / 3.2 US gal |
| Fuel Consumption | 3.0 L/100 km / 78 mpg US |
| Top Speed | 100 km/h / 62 mph |
The R 3 was a one-year 305 cc single that slotted between the R 2 and the R 4, using the same pressed-steel frame and leaf-spring front fork. With less power than the R 4 and none of the tax and licence advantages of the 200 cc R 2, it found few buyers. Only 740 were sold in 1936 before BMW replaced its singles with the new R 20 and R 35 generation.
