BMW R 51/2

From CycleChaos
Jump to navigation Jump to search


BMW R 51/2
Manufacturer
BMW
Production 1951
Class Classic
Engine
air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylinder
Bore / Stroke 68.6mm x 68.6mm
Compression ratio 6.4:1
Horsepower 24.0 HP (17.9 KW) @ 5800RPM
Transmission Gear box: 4-speed, manual

Final Drive: shaft

Clutch: dry, single plate
Suspension Front: telescopic fork
Rear: coil compression springs and rubber deflection stops
Brakes Front: 200mm drum
Rear: 200mm drum
Front Tire 3.5x19
Rear Tire 3.5x19
Wheelbase 55.0 inches (1397 mm)
Length 83.86 inches (2130 mm)
Width 32.01 inches (813 mm)
Weight 185.0 kg (wet)
Manuals Service Manual


The BMW R 51/2 was a air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylinder Classic motorcycle produced by BMW in 1951. Claimed horsepower was 24.0 HP (17.9 KW) @ 5800 RPM.

Engine[edit]

A 68.6mm bore x 68.6mm stroke result in a displacement of just 494.0 cubic centimeters.

Drive[edit]

The bike has a 4-speed, manual transmission. Power was moderated via the dry, single plate.

Chassis[edit]

It came with a 3.5x19 front tire and a 3.5x19 rear tire. Stopping was achieved via 200mm drum in the front and a 200mm drum in the rear. The front suspension was a telescopic fork while the rear was equipped with a coil compression springs and rubber deflection stops. The wheelbase was 55.0 inches (1397 mm) long.

1951 BMW R 51/2[edit]

1951 BMW R 51/2 1951 BMW R 51/2

The 1950 BMW R 51/2 is the first machine from the House of Munich to be equipped with a boxer engine, in the post-war era. It has, at its heart, an air-cooled, four-stroke, 494cc, twin cylinder powerhouse paired to a four-speed manual transmission, and can produce a claimed 24 horsepower at 5800 rpm.

Standard fittings include a telescopic front fork, a rear suspension composed of coil compression springs and rubber deflection stops a drum braking system, a single seat, a rear luggage rack, a dual exhaust, laced wheels and full fenders.


In Media[edit]