The Solituderennen (eng: Solitude race) motorsport events are held on the 11.4 km Solitudering race track near Stuttgart. The event and the track were named after the nearby Castle Solitude. Motorsports events were held there from 1903 to 1965. Due to the narrow track, initially mainly motorcycle events were held there until 1956. The track and the pits were widened in early 1957 and sports car racing was staged by the automobile club ADAC. Grand Prix motorcycle racing events were held at the track from 1952 to 1964, with the German motorcycle Grand Prix taking place there in even-numbered years: 1952, 1954, 1956, 1958, 1960, 1962 and 1964. From 1961 to 1964, non-Championship Formula One Grand Prix races were also held, in addition to previous Formula 2 and Formula Junior events. In 2003, a memorial event was held, with many former participants and vehicles. Winners (incomplete) Großer Preis der Solitude Motorcycle 50 ccm 1964: Ralph Bryans, Honda 125 ccm 1964: Jim Redman, Honda 250 ccm 1925: Josef Stelzer, BMW 1926: Josef Stelzer, BMW 1964: Phil Read, Yamaha (WC) 350 ccm 1964: 500 ccm 1925: Rudolf Reich, BMW 1964: Mike Hailwood, MV Agusta (WC) 750 ccm 1926: Karl Raebel, BMW 1,000 ccm 1926: Paul Köppen, BMW Sidecar 1964: Scheidegger/Robinson, BMW External links Solitude Memorial Site Solitude Memorial Event 2003 Grand Prix motorcycle circuits Buildings and structures in Stuttgart Sports venues in Baden-Württemberg Defunct motorsport venues in Germany