Keke Rosberg dominated the final race of his Formula One career, the 1986 Australian Grand Prix, though he did not win. While holding a 30-second lead over Nelson Piquet (his replacement at Williams), he had a rear tyre let go on lap 62. Thinking the noise from the back of his McLaren was engine related, he shut the engine off and pulled off the circuit, only to find when he got out and checked that all he needed to do was drive back to the pits to change tyres. However, he later revealed that he would never have won anyway, that he planned to give best to Alain Prost in the Frenchman's bid for back-to-back World Championships (Prost needed to win the race with Nigel Mansell finishing no better than 4th to claim the championship, while Rosberg had dropped out of title contention some races before). As it turned out, Prost won the race and the title, and a lap after Rosberg's retirement Mansell suffered the same fate as his former teammate, though in much more spectacular fashion.