chewbacca
New member
I love it when motorcyclists talk science or at least what they believe is science. Molecular size of molecules in a gas is pretty damn small. The difference in size between O2 and N2 means practically nothing. Actually Nitrogen's mass is less than Oxygen so it is probably smaller, depends a bit on the size of electron orbits and nucleus components. Both are made up of a whole lot of space. The only thing in this entire discussion that has any merit is IMO the amount of a water vapor in the tire. For the average rider, you are better off just measuring the "air" pressure in your tire and adjusting it in whichever brand of voodoo you subscribe to.This is from the nitrogen institute it is a direct quote
Ambient air contains about 21% oxygen. Oxygen?s smaller molecular size allows it to permeate through the rubber of the tire. By inflating with nitrogen, which is much less permeable than oxygen, the pressure changes due to oxygen loss are greatly reduced.