BMW R 4 (1932-37)
Comparison technical specifications
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| Make: | BMW |
| Model: | R 4 |
| Years: | 1932-37 |
| Engine: | Four stroke, single cylinder vertical |
| Capacity: | 498 cc / 30.4 cu in. |
| Bore x Stroke: | 84 x 78 mm |
| Compression Ratio: | 5.7:1 |
| Cooling System: | Air cooled |
| Induction: | 1 x carburetor type SUM CK 3/500 Fr |
| Ignition: | Battery ignition |
| Starting: | Kick |
| Generator: | Bosch 6V/45W |
| Clutch: | Single plate, dry |
| Max Power: | 10.4 kW / 14hp @ 4000 rpm |
| Transmission: | 4 Speed |
| Final Drive: | Shaft |
| Gear Ratio: | 1st 3.6 / 2nd 2.28 / 3rd 1.70 / 4th 1.30:1 |
| Frame: | Pressed steel duplex frame |
| Front Suspension: | Plate spring, 9 laminae with 2 friction shock absorbers |
| Rear Suspension: | Rigid, sping loaded saddle |
| Front Brake: | ∅160mm Drum |
| Rear Brakes: | ∅160mm Drum |
| Front Tyre: | 3.50 x 26" SS |
| Rear Tyre: | 3.50 x 26" SS |
| Wet-Weight: | 137 kg / 302 lbs |
| Fuel Capacity: | 12 L / 3.2 US gal |