Difference between revisions of "BMW R12"

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* [https://motopixel.org/pixel/wrzesien-tak-bylo#bmw-r12 Wrzesien - tak bylo...]
 
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* [https://motopixel.org/pixel/world-war-ii-in-colour#bmw-r12 World War II in Colour]
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* [https://motopixel.org/pixel/la-traversee-de-paris#bmw-r12 La traversée de Paris]
 
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Revision as of 01:37, 20 June 2019

BMW R12
1939 BMW R12
Manufacturer BMW
Also called R12 Single Carb, R12 Twin carb, R 12
Production 1935 - 1942
Predecessor BMW R11
Class Classic
Engine two cylinder boxer, four-stroke
Bore / Stroke 78.0mm x 78.0mm
Compression ratio 5.2:1
Top speed 68 mph (110 km/h)
Horse Power 17.57 HP (13.1 KW) @ 3400RPM
Ignition type magneto
Battery 5.2:1
Transmission Gear box: 4-speed

Final Drive: shaft

Clutch: dry multiplate-cable operated
Suspension Front: telescopic fork
Rear: rigid-
Brakes Front: expanding brake (drum brake)
Rear: expanding brake (drum brake)
Front Tire 3.5-19
Rear Tire 3.5-19
Wheelbase 54.33 inches (1380 mm)
Dimensions L 82.68 inches (2100 mm)
W 35.43 inches (900 mm)
H 37.01 inches (940 mm)
Weight 407.86 pounds (185.0 Kg) (dry), 185.0 kg (wet)
Fuel capacity 3.7 Gallon (14.00 Liters)
Fuel consumption 3.40 litres/100 km (29.4 km/l or 69.18 mpg)
Related BMW R17
Manuals Service Manual
Tech Specs · Brochures · Reviews · Ads · Videos

The BMW R12 Single Carb was a two cylinder boxer, four-stroke Classic motorcycle produced by BMW between 1935 and 1942. It could reach a top speed of 68 mph (110 km/h). Claimed horsepower was 17.57 HP (13.1 KW) @ 3400 RPM.

History

1938 BMW R12 Army

The R12 along with its sister model, the R17 were milestone models in the evolution of motorcycling, being the first production machines to feature a hydraulically dampened telescopic front fork. This resulted in the R12 being the best selling pre-WWII BMW motorcycle, with 36,000 units sold from 1935 to 1942, with a great many going into military service.


Engine

The engine was a air cooled two cylinder boxer, four-stroke. A 78.0mm bore x 78.0mm stroke result in a displacement of just 745.0 cubic centimeters. Fuel was supplied via a standing valves.

Drive

The bike has a 4-speed transmission. Power was moderated via the dry multiplate-cable operated.

Chassis

It came with a 3.5-19 front tire and a 3.5-19 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a telescopic fork while the rear was equipped with a rigid-. The R12 Single Carb was fitted with a 3.7 Gallon (14.00 Liters) fuel tank. The bike weighed just 407.86 pounds (185.0 Kg). The wheelbase was 54.33 inches (1380 mm) long.

1935 - 1942 BMW R 12

1935 - 1942 BMW R 12 1935 - 1942 BMW R 12 1935 - 1942 BMW R 12 1935 - 1942 BMW R 12 1935 - 1942 BMW R 12

The 1935 BMW R 12 has, at its heart, an air-cooled, four-stroke, 745cc, twin cylinder powerplant mated to a four-speed manual transmission and can produce a claimed 20 horsepower at 4000 rpm. It also comes with laced wheels, a large, round headlamp, a rear luggage rack, a telescopic front fork, a hard-tail rear suspension with a sprung single saddle, a drum braking system in the front and in the rear, a dual exhaust and a dry, double plate clutch.


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