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One aspect that hasn't been mentioned when folks talk up nitrogen inflation is that there's this pesky little thing called tha Law of Partial Pressure of Gases - also known as Dalton's Law. It states that if you have a mixture of gases, each gas behaves according to its percent by volume in the mixture.
Air is 21% oxygen, so oxygen acts like it's at 3.1 psi (14.7 X 0.21)
Where that plays out in tires is that even if a tire is completely filled with 100% nitrogen, oxygen is going to permeate back into the air chamber - and eventually the air chamber will stabilize at 3.1 psi oxygen. Put another way, if a tire is inflated to 31 psi with 100% nitrogen, eventually the air chamber will be 10% oxygen.
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