Originally Posted by Rodneykrantz
I know nitrogen isn't flammable so what exploded?
Rubber from a previous blowout apparently got wrapped around the axle of Paul Menard's car. The rubber later caught fire, so he brought the car to pit road. By the time he got there, the fire was pretty big, and the heat from the fire caused the tire to explode. There was obviously also some kind of flammable liquid present - probably brake fluid from a melted brake line or rear end lube from a melted axle seal.