BMW R39: history, specs, pictures

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Also called R39
Production 1925 - 1927
Class Classic
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

Clutch: dry, single plate
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[edit | edit source]

A 67.8mm bore x 67.8mm stroke result in a displacement of just 247.0 cubic centimeters.

Drive[edit | edit source]

The bike has a 3 speed, manual transmission. Power was moderated via the dry, single plate.

Chassis[edit | edit source]

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[edit | edit source]

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.