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R 52
   
. Data sheet
. Back to Models
Production
Begin of the Production   1928
End of the Production   1929
Numbers Produced   4377
Price   1.510,- RM
Engine
Internal Designation   M 57
Motor Type   four-stroke two-cylinder flat-twin
Bore x Stroke   63 x 78 mm
Displacement   486 ccm
Max Power   12 hp at 3400 rpm
Compression Ratio   5.0 : 1
Valves   sv
Carburetion System   1 x carburettor, BMW Spezial two-valve 22 mm
Engine Lubricating System   forced-feed lubrication
Oil Pump   gear pump
Power transmission
Clutch   single-plate, dry - from engine no. 50761:two plates
Number of Gears   3
Shifting   manual
Gearbox Ratios   2.83 / 1.55 / 1.08
Rear Wheel Ratio   1 : 4.38 or 1 : 4.75 (with sidecar 1 : 5.7)
Bevel / Crownwheel   13 / 57 or 12 / 57 teeth (with sidecar 10 / 57)
Electrical system
Ignition System   Bosch high-voltage magneto ignition
Generator   Bosch magneto generator on request
Spark Plugs   Bosch W 175
 
Chassis
Designation   F 56
Frame   twin-loop steel tubular frame
Front Wheel Suspension   plate spring, 6 laminae
Rear Wheel 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)
Dimensions / Weights
Length x Width x Height   2100 x 800 x 950 mm
Wheel Base   1400 mm
Fuel Tank Capacity   12,5 l
Unladen Weight, Full Tank   152 kg
Load Rating   210 kg
Fuel Consumption   approx. 3,5 l/100 km
Oil Consumption   approx. 1 - 2 l/1000 km
Top Speed   100 kph