Steinhausen made his debut in motorcycle racing in 1961. After a few incidents, in 1964 moved on to the sidecar class, driven also by his friendship with the four-time World Sidecar Champion Max Deubel. Deubel recognized Steinhausen's talent and gave him one of his sidecars.

Having started with the sidecar powered by BMW in 1972 Steinhausen decided to use the engines of König, four-cylinder two-stroke of powerboat origin. The new engines allowed the German to build a sidecar lower and with better aerodynamics. In that year the German also made his debut in the Grand Prix motorcycle racing World Championship, where he came tenth in partnership with Werner Kapp, achieving a best result of fourth place at the Austrian GP.

The following season Steinhausen was 6th in the World (alternating passengers, Karl Scheurer and Erich Schmitz), getting his first podium finish (third in the Sidecar TT). For the '74 season, the German made a new chassis with the specialist Dieter Busch. With the new sidecar Steinhausen won his first GP (one of Belgium) and was fourth in the World (alternating two passengers this year too: Scheurer and Josef Huber).

The 1975 saw Steinhausen (paired with Huber) graduate to Champion of the World, thanks to three wins ( Austria, TT and Belgium). That '75 was also the first title for a two-stroke sidecar. In 1976 Steinhausen is reconfirmed champion (winning again the same three GP as the previous year) and the 500cc Sidecar TT.

The '77 season saw Steinhausen favorite for the title, but he did not do it, for various engine problems. From the French GP Steinhausen changed to a new engine from Yamaha and a new passenger (Wolfgang Kalauch), which ended the season in 4th place with a win in Czechoslovakia. Remembered for the Belgian Grand Prix, where the German marked the lap record at 200.520 km/h.

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Wikipedia