a Grand Prix in Aix-Les-Bains, in July 1953. His time was 2:24:48.1. In April 1956 Rosier finished 4th in a Maserati, in a 201-mile race at Aintree. Stirling Moss drove a blue Maserati to victory in the 67-lap event for Formula One cars, with an average speed of . Rosier finished 5th at the 1956 German Grand Prix behind the wheel of a Maserati.