Do tell... Please, what is the Molecular size difference and the effect on permeability?
Originally Posted by 40w8
As you add air a few times the oxygen will have slipped out since much smaller molecule. As the tires age they should tighten up, and lose less air. My Hankook V12's were so hard at 4 years they held 35 psi for 2 more years.....not even kidding.