BMW R 50

BMW R 50 Date 1955 - 1960

Number sold 3.510

Price 3050,- DM

Engine

Internal Designation 252 / 2
Engine type four-stroke two-cylinder flat-twin
Bore/stroke 68 x 68 mm
Cubic capacity 494 cm3
Max power 26 PS at 5800 rpm
Compression ratio 6,8 : 1
Valves per cylinder ohv
Carburation system 2 carburettor Typ Bing 1/24/45-1/24/46
Engine lubrication forced-feed lubrication
Oil pump gear pump

Power transmission

Clutch single disc saucer spring, dry
Number of gears 4
Shifting foot Shifting
Gear ratios 5,33 / 3,02 / 2,04 / 1,54
Rear wheel ratio 1 : 3,18 (with sidecar 1 : 4,25 or 1 : 4,33)
Bevel/crown wheel 11 / 35 teeth (with sidecar 8 / 34 or 6 : 26)

Electrical system

Alternator Noris L 60/6/1500 L
Ignition magneto ignition
Spark plugs Bosch W 240 T 1

Suspension

Designation 245/1
Type of frame twin-loop steel tubular frame
Front suspension long swinging arm with strut und oil-pressure shock absorbers
Rear suspension long swinging arm with strut und oil-pressure shock absorbers
wheel rims deep-bed 3 x 18 ( at sidecar, rear 2,75C x 18)
Tyres front 3,50 x 18
Tyres rear 3,50 x 18 ( at sidecarbetrieb hinten 4 x 18)
Brakes front drum brake, 200 mm Duplex full hub
Brakes rear drum brake, 200 mm Simplex full hub

Dimensions and weights

Length x width x height 2125 x 660 x 980 mm
Wheel base 1415 mm (with sidecar 1450 mm)
Tank capacity 17 l
Unladen weight, full tank 195 kg (with orig. BMW sidecar 320 kg)
Load rating 360 kg (with orig. BMW sidecar 600 kg)
idle/riding noise 81/82 DIN-phon (from Dezember 1955: 82 / 76 phon)
Fuel consumption ca. 4,1 l / 100 km
Oil consumption ca. 0,5 - 1 l / 1000 km
Top speed 140 km/h (with orig. BMW sidecar 100 km/h)

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