BMW R 50
Number sold 3.510
Price 3050,- DM
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| 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 U /min |
| 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 |
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| Power transmission | |
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| 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) |
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| Electrical system | |
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| Alternator | Noris L 60/6/1500 L |
| Ignition | magneto ignition |
| Spark plugs | Bosch W 240 T 1 |
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| Suspension | |
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| 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, Ø 200 mm Duplex full hub |
| Brakes rear | drum brake, Ø 200 mm Simplex full hub |
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| Dimensions and weights | |
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| 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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