Neckarsulm Strickmaschinen Union (NSU) emerged from producing knitting machines and bicycles to motorcycles and cars. By the mid 1950s, NSU had grown to become one of the largest motorcycle producers in the world. It directly translated great success on the racetrack with the Rennfox and Sportmax machines into showroom sales, as they amassed victories in sidecar, 125cc and 250cc world championships (see Of silver dolphins and blue whales). One of the best translations was the NSU Supermax.
The Supermax was introduced in 1953, and was designed by Albert Roder who had worked on the supercharged racing motors. It was a 250cc 4 stroke single, producing about 18hp at 6500rpm, and weighing just 384lbs. The innovative features introduced included a new "calm" air filtration system, and a chain driven overhead camshaft. At the time, these were somewhat ground-breaking on a production motorcycle. It also featured a four speed gearbox which propelled the machine to 78mph. Very respectable for a 250cc thumper. Brakes were drum front and rear, on 19 inch wheels. Other innovations included the monocoque pressed steel frame, and a short rocker front suspension.
The Supermax enjoyed very good sales, helping to propel NSU to become the world's largest motorcycle producer in 1955. They also held world speed records in 1951, 1953, 1954, and 1955, including breaking the 200mph mark for motorcycles at Bonneville. The Supermax model continued until it was replaced in 1961.