Following several tyre failures before the race, which caused major accidents for Ralf Schumacher's Toyota during Friday practice and then for his Toyota stand-in Ricardo Zonta, Michelin advised its seven customer teams that without a reduction in speed in Turn 13, the tyres provided for the race would only be safe for 10 laps. Michelin had been providing working tyres for the race since 2001. The situation was worsened by the 2005 Formula One rules, which forbade tyre changes during the race, and a repave of the oval portion of the course after the 2004 Brickyard 400.