look at the drawing pizza chop supplied in your other post on this question..
with the hub faces as 80 inches the wheels/tires would be 86-90 inches or approximately 7 & 1/2 feet.
all of the true things that i am about to tell you are shameless lies. l.b.j.
we are here on earth to fart around. don't let anybody tell you any different. k.v.