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R 51/2
   
. Data sheet
. Back to Models
Production
Begin of the Production   1950
End of the Production   1951
Numbers Produced   5000
Price   2.750,- DM
Engine
Internal Designation   254/3
Motor Type   four-stroke two-cylinder flat-twin
Bore x Stroke   68 x 68 mm
Displacement   494 ccm
Max Power   24 hp at 5800 rpm
Compression Ratio   6.4 : 1
Valves   ohv
Carburetion System   2 x carburettor type Bing 1/22/39 and 1/22/40
Engine Lubricating System   forced-feed lubrication
Oil Pump   gear pump
Power transmission
Clutch   single-plate, dry
Number of Gears   4
Shifting   foot shifting (+ auxiliary manual lever on the gear block)
Gearbox Ratios   3.6 / 2.28 / 1.7 / 1.3
Rear Wheel Ratio   3.89 : 1 (with sidecar 4.57 : 1)
Bevel / Crownwheel   9 / 35 (with sidecar 7 / 32)
Electrical system
Ignition System   battery ignition
Generator   Bosch 6 V/75 W
Spark Plugs   Bosch W 240 T1
 
Chassis
Designation   251/2
Frame   closed double steel tubular frame
Front Wheel Suspension   telescopic fork
Rear Wheel Suspension   telescopic suspension
Wheel Rims   deep-bed rims
Tyres front   3.5 x 19
Tyres rear   3.5 x 19
Brakes front   drum brakes Ø 200 mm (half hub)
Brakes rear   drum brakes Ø 200 mm (half hub)
Dimensions / Weights
Length x Width x Height   2130 x 815 x 720 mm (Saddle)
Fuel Tank Capacity   14 l
Unladen Weight, Full Tank   185 kg
Clearance   120 mm
Load Rating   400 kg
Fuel Consumption   approx. 4 l/100 km
Oil Consumption   approx. 1 l/1000 km
Top Speed   135 kph