Start of Production

1923

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End of Production

1926

Numbers Produced

3,090

Price

2,200 RM

Engine

 

Internal Designation

M 2 B 33

Motor Type

Four-stroke two cylinder flat twin

Bore x Stroke

68 x 68 mm (2.67 x 2.67 in)

Displacement

494 cc

Max Power

8.5 hp at 3,200 rpm

Compression Ratio

5.0 : 1

Valves

SV

Carburation System

1 carburettor, Type BMW Spezial 22 mm

Engine Lubricating System

Forced feed lubrication

Oil Pump

Gear pump



Power Transmission

 

Clutch

Single plate, dry

Number of Gears

3

Shifting

Manual

Gearbox Ratios

2.27 / 1.50 / 1.08

Rear Wheel Ratio

1 : 4.41 (1 : 5.36 with sidecar)

Bevel/Crownwheel

17 / 75 teeth (14 / 75 with sidecar)



Electrical System

 

Ignition System

Bosch magneto ignition

Generator

Magneto generator on request

Spark Plugs

Bosch W 145






Chassis

 

Designation

R32

Frame

Twin loop tubular frame

Front wheel suspension

Twin cantilever spring

Rear wheel suspension

Rigid

Wheel rims

26 x 2.5

Tyres, Front

26 x 3

Tyres, Rear

26 x 3

Brakes, Front

Drum brake 150 mm / 5.9 in diameter (not for 1st Series)

Brakes, Rear

Block brake




Dimensions/Weights

 

Length x Width x Height

2100 x 800 x 950 mm (82.67 x 31.49 x 37.40 in)

Wheel Base

1380 mm / 54.33 in

Fuel Tank Capacity

14 litres / 3.07 gal / 3.69 gal US

Unladen Weight with Full Tank

122 Kg / 268 lb (184 Kg / 405 lb with original sidecar)

Fuel Consumption

3 litres 100 Km approx / 94 mpg / 78 mpg US

Oil Consumption

2.5 litres per 1,000 Km approx.

Top Speed

95 -100 Kph / 59 - 62 mph

Information kindly supplied by P.Hawksley

www.bmbikes.co.uk