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1943 BMW R75

Monday, February 8, 2010 7:03 PM




BMW and Zündapp used 70% of the same components. This simplifies the supply of spare parts for these vehicles, many of which are still in the hands of historic motorcycle enthusiasts. These vehicles are desirable as collector's items because of their complex and durable technology. A well-restored R75 can be still used for everyday purposes, on or off-road without problems.

1943 BMW R75 specification :

Start of Production

1941



End of Production

1944

Numbers Produced

18,000 approx.

Price

2,630 RM

Engine


Internal Designation

275/2

Motor Type

Four-stroke two cylinder flat twin

Bore x Stroke

78 x 78 mm (3.07 x 3.07 in)

Displacement

745 cc

Max Power

26 hp at 4,000 rpm

Compression Ratio

5.8 : 1

Valves

OHV

Carburation System

2 x carburettor type Graetzin Sa 24/1 and Sa 24/2

Engine Lubricating System

Forced feed lubrication

Oil Pump

Gear pump



Power Transmission


Clutch

Single plate, dry

Number of Gears

"Road": 4 + 1 reverse gear, "off-road": 3 + 1 reverse gear

Shifting

Foot and manual shifting with selector lever "off-road" + "road"

Gearbox Ratios

"Road": 3.22 / 1.83 / 1.21 / 0.90, reverse gear 2.41, "off-road": 4.46 / 2.54 /1.67, reverse gear 3.3

Rear Wheel Ratio

1 : 6.05 (from production No. 754056 1 : 5.69)



Electrical System


Ignition System

Magneto ignition

Generator

Noris DS 6/50

Spark Plugs

Bosch W 175 T1



Chassis


Designation

275/1

Frame

Multi part, bolted steel tubular frame

Front wheel suspension

Telescopic fork

Rear wheel suspension

Rigid, plate springs on the boat, tube springs on sidecar wheel

Wheel rims

3D x 16

Tyres, Front

4.5 x 16 (off road block profile)

Tyres, Rear

4.5 x 16 (off road block profile)

Brakes, Front

Drum brake 250 mm / 9.84 in diameter, mech.

Brakes, Rear

Drum brake 250 mm / 9.84 in diameter, mech; sidecar drum brakes 250 mm / 9.84 in diameter, hydraulic



Dimensions/Weights


Length x Width x Height

2400 x 1730 x 1000 mm (94.48 x 68.11 x 39.37 in) (with sidecar)

Wheel Base

1444 mm / 56.85 in

Fuel Tank Capacity

24 litres / 5.27 gal / 6.34 gal US

Unladen Weight with Full Tank

400 Kg / 881 lb with original sidecar

Load Rating

270 Kg / 594 lb

Fuel Consumption

Approx. 6.3 litres per 100 Km / 44 mpg / 37 mpg US (road), 8.5 litres per 100 Kph / 33 mpg / 27 mpg US (off-road)

Oil Consumption

Approx. 0.5 - 1 litre per 1,000 Km

Top Speed

95 Kph / 59 mph


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