BMW R 20

BMW R 20 Date 1937/38

Number sold 5.000

Price 725,- RM

Engine

Internal Designation 220/1
Engine type four-stroke vertical single cylinder engine
Bore/stroke 60 x 68 mm
Cubic capacity 192 cm3
Max power 8 PS at 5400 rpm
Compression ratio 6,0 : 1
Valves per cylinder ohv
Carburation system 1 push-in-carburettor Amal M 74/428
Engine lubrication forced-feed lubrication
Oil pump gear pump

Power transmission

Clutch single discs, dry
Number of gears 3
Shifting foot Shifting
Gear ratios 4,55 / 2,58 / 1,64
Rear wheel ratio 1 : 4,18
Bevel/crown wheel 11/ 46 teeth

Electrical system

Alternator Bosch 6V / 50 Watt
Ignition battery ignition
Spark plugs Bosch DM 175 T 1 or Beru K 175

Suspension

Designation 220/1
Type of frame twin-loop frame, bolted
Front suspension telescopic fork
Rear suspension rigid
wheel rims 2,5 x 19 deep-bed
Tyres front 3 x 19
Tyres rear 3 x 19
Brakes front drum brake 160 mm
Brakes rear drum brake 160 mm

Dimensions and weights

Length x width x height 2000 x 800 x 920 mm
Wheel base 1330 mm
Tank capacity 12 l
Unladen weight, full tank 130 kg
permitted loading 200 kg
Fuel consumption ca. 2,75 l / 100 km
Oil consumption ca. 1 - 2 l / 1000 km
Top speed 95 km/h

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