|Production||1926 - 1928|
air-cooled, four-stroke, boxer twin cylinder, SV
|Bore / Stroke||68.6mm x 68.6mm|
|Top Speed||59 mph (95 km/h)|
|Horsepower||11.67 HP (8.7 KW) @ 3400RPM|
|Fuel System||carburetor. 20mm BMW spezial|
|Transmission||Gear box: 3 speed, manual
Final Drive: shaft
|Suspension||Front: plate spring, 5 laminae
Rear: hard-tail, sprung seat
|Brakes||Front: 150mm drum
Rear: external shoe brake at gearing (on cardan shaft)
|Front Tire||27 x 3.5|
|Rear Tire||27 x 3.5|
|Wheelbase||55.51 inches (1410 mm)|
|Length||82.68 inches (2100 mm)|
|Width||31.5 inches (800 mm)|
|Height||37.4 inches (950 mm)|
|Weight||126.0 kg (wet)|
The bike has a 3 speed, manual transmission. Power was moderated via the dry, single plate.
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 gearing (on cardan shaft) in the rear. The front suspension was a plate spring, 5 laminae while the rear was equipped with a hard-tail, sprung seat. The wheelbase was 55.51 inches (1410 mm) long.
1926 - 1928 BMW R 42
The R 42 from the House of Munich had, at its heart, an air-cooled, four-stroke, 494cc, boxer twin cylinder engine mated to a three-speed manual transmission, and could reach a claimed maximum power output of 12 horsepower at 3400 rpm. Standard features included laced wheels, long fenders, a small headlamp, wide handlebars, a plate string front fork, a rigid rear suspension with a sprung seat, a rear luggage rack that could be transformed in a passenger seat, and a front drum brake.