what trips end of run?

The stage beams are less than 3 inches off the ground. All other beams are 6 inches off the ground. So cars that are at the legal three inches in front trip the beams with the body. Most door cars will trip the beams with the tires, Dragsters, altereds and such usually have some sort of nose that is in front of the front tires that is 3 inches off the ground.