SONOMA, Calif. -- Officials with Goodyear said it was a combination of increased speed and heat buildup that led to Tony Stewart's crash on Tuesday at Indianapolis Motor Speedway. Stewart, a three-time NASCAR Sprint Cup Series champion, was one of six drivers taking part in the two-day Goodyear tire test. According to a news release from Goodyear, Stewart's No. 14 Chevrolet hit the wall after losing air in the right-front tire. "Tony was approaching the end of a very strong 20-lap run," said Greg Stucker, Goodyear's director of racing, "with his lap times as much as a second faster than what has become the norm at Indianapolis at that point of a run. More...