Dale Earnhardt Jr.'s Tire Burst Into Flame After It Exploded

Phoenix International Raceway hasn't been kind to right rear tires during today's CampingWorld.com 500 NASCAR Sprint Cup race. Sam Hornish Jr. ate the wall earlier after his right rear tire failed, but it was Dale Earnhardt Jr.'s tire that was the most explosive failure of them all. » 3/15/15 6:23pm 3/15/15 6:23pm