BMW R 52
Number sold 4.377
Price 1.510,- RM
| Engine | |
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| internal designation | M 57 |
| engine type | four-stroke two-cylinder flat-twin |
| Bore/stroke | 63 x 78 mm |
| Cubic capacity | 486 cm3 |
| Max power | 12 PS at 3400 U /min |
| Compression ratio | 5,0 : 1 |
| Valves per cylinder | sv |
| Carburation system | 1 carburettor, Typ BMW Spezial two-valve 22 mm |
| Engine lubrication | forced-feed lubrication |
| oil pump | gear pump |
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| Power transmission | |
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| Clutch | single discs, dry - from engine no. 50761: two discs |
| Number of gears | 3 |
| shifting | manual |
| Gear ratios | 2,83 / 1,55 / 1,08 |
| Rear wheel ratio | 1 : 4,38 or 1 : 4,75 (sidecar 1 : 5,7) |
| Bevel/crown wheel | 13 / 57 or 12 / 57 teeth (sidecar 10 / 57) |
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| Electrical system | |
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| Alternator | magneto generator on request Bosch |
| Ignition | Bosch high-voltage magneto ignition |
| Spark plugs | Bosch W 175 |
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| Suspension | |
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| designation | F 56 |
| Type of frame | twin-loop steel tubular frame |
| Front suspension | plate spring, 6 laminae |
| Rear suspension | rigid |
| wheel rims | deep-bed 19 x 3 |
| Tyres front | 26 x 3,5 low pressure or 26 x 3,25 high pressure |
| Tyres rear | 26 x 3,5 low pressure or 26 x 3,25 high pressure |
| Brakes front | drum brake Ø 200 mm |
| Brakes rear | external shoe brake at gearing (on cardan shaft) |
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| Dimensions and weights | |
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| Length x width x height | 2100 x 800 x 950 mm |
| Wheel base | 1400 mm |
| Tank capacity | 12,5 l |
| Unladen weight, full tank | 152 kg |
| load rating | 210 kg |
| Fuel consumption | ca. 3,5 l / 100 km |
| oil consumption | ca. 1 - 2 l / 1000 km |
| Top speed | 100 km/h |
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