BMW R 39
| Production Year: | 1925, 1926, 1927 |  |
| Type: | air-cooled, four-stroke, single vertical cylinder, OHV |
| engine specs | |
| Type | air-cooled, four-stroke, single vertical cylinder, OHV |
| Displacement | 247 cm3 |
| Bore X Stroke | 2.67x2.67 in OR 68 mm |
| Compression Ratio | 6:1 |
| Horsepower | 6/4000 KW(hp)/RPM |
| Fuel System | 1x20mm BMW Spezial |
| transmission specs | |
| Gearbox | 3 speed, manual |
| Clutch | dry, single plate |
| Final Drive | shaft |
| chassis specs | |
| Frame | steel |
| Front Suspension | plate spring, 4 laminae |
| Rear Suspension | hard-tail, sprung seat |
| Front Brake | 150mm drum |
| Rear Brake | external shoe brake at the gearing (on cardan shaft) |
| dimension specs | |
| Overall Length | 80 in OR 2032 mm |
| Overall Width | 31 in OR 787 mm |
| Weight | 242 lbs OR 110 kg |
| Fuel Capacity | 2.64 gallons OR 10.0 L |
| tyres specs | |
| Front | 27 x 3.5 |
| Rear | 27 x 3.5 |
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