During the 2005 Formula One season, a rule mandated all cars must run an entire (305 km / 190 miles) race on one set of tires, and there was a tire war between Bridgestone and Michelin during the season. That led to controversy when two crashes in practice took place with Michelin-shod cars because of tire failure, especially with the high g-loads through turns 12 and 13. On race morning, all cars utilizing Michelin tires withdrew from the race on the formation lap due to safety concerns and the rules in question at the time. The controversy tarnished the event, angered fans and media, and led to costly ticket refunds.