The BMW R75 is a World Warfare II-era motorcycle and sidecar combination made by the German company BMW.
In the 1930s BMW were producing a number of popular and impressive motorcycles. In 1938 development of the R75 started in reaction to a demand from the German Military.
Preproduction types of the R75 were driven by the 750 cc aspect valve engine, that was predicated on the R71 engine unit. Nonetheless it was quickly found essential to design an all-new OHV 750 cc engine motor for the R75 unit. This OHV engine later became the foundation for subsequent post-war twin BMW engines like the R51/3, R67 and R68.
The 3rd side-car wheel was driven with an axle connected to the trunk wheel of the motorcycle. These were built in with a locking differential and selectable street and off-road gear ratios through which all four and invert gears did the trick. This made the R75 highly manoeuvrable and with the capacity of negotiating most surfaces. A few other motorcycle manufactures, like FN and Norton, provided an optional drive to sidecars.
The BMW R75 and its own rival the Z?ndapp KS 750 were both broadly employed by the Wehrmacht in Russia and North Africa, though after a period of evaluation it became clear that the Z?ndapp was the superior machine. In August 1942 Z?ndapp and BMW, on the urging of the Army, agreed upon standardization of parts for both machines, with a view of eventually making a Z?ndapp-BMW hybrid (chosen the BW 43), in which a BMW 286/1 side-car would be grafted onto a Z?ndapp KS 750 motorcycle. They also decided that the manufacture of the R75 would stop once production come to 20,200 systems, and from then on point BMW and Z?ndapp would only produce the Z?ndapp-BMW machine, processing 20,000 every year.
Since the concentrate on of 20,200 BMW R75's had not been reached, it remained in production before Eisenach manufacturing plant was so badly harmed by Allied bombing that production ceased in 1944. An additional 98 devices were assembled by the Soviets in 1946 as reparations.
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