The R series are built around a two piston, horizontally opposed Flat-twin engine. As the engine is mounted transversally across the bike, and the heads protrude well beyond the frame of the bike, R series motorcycles are quite visually distinctive. Originally R series bikes had air-cooled heads ("air heads"), but are now produced only with oil-cooled heads ("oilheads"). In the U.S. most law enforcement agencies currently use the R series, replacing the Kawasaki Police 1000

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In 1916, two companies, Gustav Otto's Flugmaschinenfabrik (Aeroplane Factory) and Karl Rapp's Flugwerke Deutschland, merged to form the Bayerische Flugzeugwerke (Bavarian Aeroplane Works). Initially this company designed and manufactured aeroplane engines. The Bayerische Flugzeugwerke was renamed the Bayerische Motoren Werke (Bavarian Motor Works, BMW) in 1917 by Karl Rapp and Max Friz. Their new logo, a roundel representing an aeroplane propeller in the blue sky, is still used today on all BMW motorcycles and automobiles. A former Daimler employee, Joseph Popp became BMW's managing director. Aeroplane engines, especially a V-12 model, were BMW's primary output.

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