Prix Jean Prat metres. For a period it was held in April, and it served as a trial for the Prix du Jockey Club. Both Prix Biennal races were renamed the Prix Jean Prat in 1940. This was in memory of Jean Prat (1847–1940), a successful racehorse owner and breeder. The version for three-year-olds was switched to late May or early June in 1961. It was shortened to 1,850 metres in 1962. It was transferred to Chantilly and cut to 1,800 metres in 1967. The present system of race grading was introduced in 1971, and for several years the event held Group 2
1991 Vitesse du Mans motorcycle Grand Prix 1991 Vitesse du Mans motorcycle Grand Prix The 1991 Vitesse du Mans motorcycle Grand Prix was the penultimate round of the 1991 Grand Prix motorcycle racing season. It took place on the weekend of 6–8 September 1991 at the Bugatti Circuit located in Le Mans. France. Originally meant to be held in Brazil, that race was cancelled for safety reasons, so the FIM decided to add a second French round. It is the only time in FIM Grand Prix motorcycle racing history two rounds were held in France during a season. The race's name was used for this race only,