In 1937, The successful R12 and R17 were the first production motorcycles to use a modern front suspension, though they lacked any rear suspension at all.
The new 750cc engines were the largest and most powerful yet produced by BMW, a 16 horsepower sidevalve, and a 28 horsepower OHV version.
The R12 went on to be BMW's most produced model until the R75/5 of the early 1970's. Nearly 30,000 of them were made, 20,000 as civilian models (most of which were conscripted in 1939), and another 10,000 specifically built for the Wehrmacht.
BMW R12s did yeoman service in the German Army of WWII, but were eventually replaced by a purpose-built military model, the R75, in 1942. In addition to the messenger and scout roles that motorcycles played in the Allied armies, the Germans equipped motorized infantry regiments with R12 sidecar rigs and made war with them. The motorcycle units were the fastest in the blitzkrieg, and saw combat from the steppes of Russia to the deserts of North Africa.
Today, R12's are still in operation all over the world, including about 30 examples in the USA. Used, original, and reproduction parts are available from several German sources, and small numbers of machines, have recently appeared from former iron-curtain countries.
This macro was tested only in CFS1 sceneries, but I believe that can work without problems in CFS2-3 and FS2000-2002.
All mine API macros, could be included on objects libraries with crash detection (for CFS missions), but must be distributed with the original API-MACRO copyright.