BMW R 39 (1925-27)
Comparison technical specifications
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| Make: | BMW |
| Model: | R 39 |
| Years: | 1925-27 |
| Engine: | Four stroke, single cylinder vertical, OHV |
| Capacity: | 247 cc / 15.1 cu in. |
| Compression Ratio: | 6.0:1 |
| Cooling System: | Air cooled |
| Induction: | 1 x BMW Spezial ∅20 mm |
| Ignition: | Bosch magneto generator type G 1.8V/15W |
| Starting: | Kick |
| Clutch: | Single plate, dry |
| Max Power: | 4.8 kW / 6.5 hp @ 4000 rpm |
| Transmission: | 3 Speed |
| Final Drive: | Shaft |
| Frame: | Twin loop tubular frame |
| Front Suspension: | Plate spring, 4 laminae |
| Rear Suspension: | Rigid, spring loaded saddle |
| Front Brakes: | Internal shoe drum brake ∅150 mm / ∅5.90 in diameter |
| Rear Brakes: | External shoe brake at the gearing on Cardan shaft |
| Front Tyre: | 27 x 3.5" balloon or with 26 x 3.0" high pressure tyres |
| Rear Tyre: | 27 x 3.5" balloon or with 26 x 3.0" high pressure tyres |
| Wet-Weight: | 110 kg / 242 lbs |
| Fuel Capacity: | 10 liters / 2.6 US gal |