Start of Production

1925

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End of Production

1926

Numbers Produced

152

Price

2,900 RM

Engine

 

Internal Designation

M 2 B 36

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

16 hp at 4,000 rpm

Compression Ratio

6.2 : 1

Valves

OHV

Carburation System

1 carburettor Type BMW Spezial  three valve 26 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/ 7 5 with sidecar)



Electrical System

 

Ignition System

Bosch magneto Ignition

Generator

Magneto generator on request

Spark Plugs

Bosch W 175






Chassis

 

Designation

R37

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 / 5.90 indiameter

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

134 Kg / 295 lb (with original sidecar 184 Kg / 405 lb)

Fuel Consumption

Approx. 4 litres per 100 Km / 70 mpg / 58 mpg US

Oil Consumption

Approx. 3 litres per 1,000 Km

Top Speed

115 Kph / 71 mph

Information kindly supplied by P.Hawksley

www.bmbikes.co.uk