1. FKS by Franz Krause Fahrzeugbau, Sebastianstraße, Berlin S14, 1921-1925
His first machines had 148 cc engines which were attached above the front wheel which it drove via belt.
From 1923 the firm built motorcycles with the engine mounted within the frame frame - one of these was a KC 298cc twin-cylinder two-stroke boxer engine sourced from supplied by Kirchheim of Magdeburg.
According to OTTW, FKS machines competed at the Marienberger circuit in 1926 and 1927, ridden by H. Gehrmann the 175cc class in '26, and then in the 250 class.
2. Fritz Kläger Spezial FKS, Freiburg, 1966-1970
Built racing motorcycles of 250cc to 500cc.
Kläger began racing in the early 1930s, achieving his first victory as an Ice Racer in 1934. After the war he became quite famous as both a rider and builder. He rode with the Horex GP team in the mid-1950s and appeared often on the podium. He took second in the German championship of 1957. After 35 years of competition he retired, in 1969. He died at the age of 93, in 2007.