BMW R39: history, specs, pictures
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| BMW R39 | |
| Manufacturer | |
|---|---|
| Also called | R39 |
| Production | 1925 - 1927 |
| Class | Classic |
| Engine | air-cooled, four-stroke, single vertical cylinder, OHV |
| Bore / Stroke | 67.8mm x 67.8mm |
| Compression ratio | 6:1 |
| Top Speed | 62 mph (100 km/h) |
| Horsepower | 5.9 HP (4.4 KW) @ 4000RPM |
| Transmission | Gear box: 3 speed, manual Final Drive: shaft |
| Suspension | Front: plate spring, 4 laminae Rear: hard-tail, sprung seat |
| Brakes | Front: 150mm drum Rear: external shoe brake at the gearing (on cardan shaft) |
| Front Tire | 27 x 3.5 |
| Rear Tire | 27 x 3.5 |
| Length | 80.0 inches (2032 mm) |
| Width | 30.98 inches (787 mm) |
| Weight | 110.0 kg (wet) |
| Manuals | Service Manual |
The BMW R 39 was a air-cooled, four-stroke, single vertical cylinder, OHV Classic motorcycle produced by BMW in 1925. Claimed horsepower was 6.03 HP (4.5 KW) @ 4000 RPM.
Engine
A 67.8mm bore x 67.8mm stroke result in a displacement of just 247.0 cubic centimeters.
Drive
The bike has a 3 speed, manual transmission. Power was moderated via the dry, single plate.
Chassis
It came with a 27 x 3.5 front tire and a 27 x 3.5 rear tire. Stopping was achieved via 150mm drum in the front and a external shoe brake at the gearing (on cardan shaft) in the rear. The front suspension was a plate spring, 4 laminae while the rear was equipped with a hard-tail, sprung seat.
1925 - 1927 BMW R 39
The 1925 BMW R 39 sports an air-cooled, four-stroke, 247cc, single vertical cylinder engine paired to a three-speed manual transmission and can produce 6.5 horsepower at 4000 rpm. Furthermore, this machine came standard with laced wheels, whitewall tires, a plate string front fork, a rigid rear suspension with a single, sprung saddle, a rear luggage rack, a small headlight, a short exhaust and tipped the scale, fully-fueled at just 110 kg.