NSU Motorenwerke possible that in 1955, NSU became the biggest motorcycle producer in the world. NSU also holds four world records for speed: 1951, 1953, 1954, and 1955. In August 1956, Wilhelm Herz at the Bonneville Salt Flats, Utah, became the first man to ride a motorcycle faster than . In 1957, NSU re-entered the car market with the new Prinz (Prince), a small car with a doubled NSU Max engine, an air-cooled two-cylinder engine of and . Motorbike production continued until 1968. NSU's last production motorcycle was the Quick 50. In 1964, NSU offered the world's first Wankel engined car: the
Triumph Speed Four Triumph Speed Four The Triumph Speed Four is a standard or streetfighter motorcycle made by Triumph from 2002 to 2006 as the naked, or non-faired brother of the TT600 sport bike introduced in 1999. The Speed Four has similar twin round headlghts to the Speed Triple, but a different frame and engine. The Speed Four has the clip-on handlebars of the TT600, rather than the motocross-inspired handlebars of the Speed Triple and other streetfighters. The Speed Four is mechanically similar to its predecessor, the TT600, with the exceptions of the cam profiles, ignition and fuel injection mapping, front spring rate,