Originally Posted by
noisebeam
Are you also disputing that psi doesn't make a difference? The unloaded circumference of a tire at 20psi is very very close the the circumference of same tire at 120psi.
If the circumference doesn't change, then the rollout won't change. They are by definition the same measurement.
Pumping up a tire should stretch it out/change the shape, so it should increase the circumference. By how much, i don't know. And I'm speculating.
JB