BMW R20

 

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Start of Production

1937

End of Production

1938

Numbers Produced

5,000

Price

725 RM

Engine

 

Internal Designation

220/1

Motor Type

Four-stroke single cylinder vertical

Bore x Stroke

68 x 68 mm (2.67 x 2.67 in)

Displacement

192 cc

Max Power

8 hp at 5,400 rpm

Compression Ratio

6.0 : 1

Valves

OHV

Carburation System

1 x Amal push in carburettor M 74/428

Engine Lubricating System

Forced feed lubrication

Oil Pump

Gear pump



Power Transmission

 

Clutch

Single plate, dry

Number of Gears

3

Shifting

Foot switching

Gearbox Ratios

4.55 / 2.58 / 1.64

Rear Wheel Ratio

1 : 4.18

Bevel/Crownwheel

11 / 46 teeth



Electrical System

 

Ignition System

Battery ignition

Generator

Bosch 6V/50W

Spark Plugs

Bosch W175 T1 or Beru K175






Chassis

 

Designation

220/1

Frame

Twin loop frame, bolted

Front wheel suspension

Telescopic fork

Rear wheel 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 / 6.29 in diameter

Brakes, Rear

Drum brake 180 mm / 7.08 in diameter




Dimensions/Weights

 

Length x Width x Height

2000 x 800 x 920 mm (78.74 x 31.49 x 36.22 in)

Wheel Base

1330 mm / 52.36 in

Fuel Tank Capacity

12 litres / 2.63 gal / 3.17 gal US

Unladen Weight with Full Tank

130 Kg / 286 lb

Load Rating

200 Kg / 440 lb

Fuel Consumption

Approx. 2.75 litres per 100 Km / 102 mpg / 85 mpg US

Oil Consumption

Approx. 1 - 2 litres per 1,000 Km

Top Speed

95 Kph / 59 mph

 

Information kindly supplied by P.Hawksley

www.bmbikes.co.uk