Paired with the Swiss driver Ciro Basadonna, Chiron won the 1954 Monte Carlo Rally, and achieved podium finishes in the fifteen Formula One races he entered that year. His last race was in 1955, when he took a Lancia D50 to sixth place in the Monaco Grand Prix a few weeks before his 56th birthday, becoming the oldest driver to compete in a Formula One race. He is also the oldest driver ever to have entered for a Formula One race, taking part in practice for the 1958 Monaco Grand Prix when he was 58.