Nitrogen vs. Oxygen

67Dart273 said
I think it's all over-hyped. Moisture in "common air" (air compressor) would be one factor. There's only so much oxygen in a "fill" of a tire, so any hype about oxygen oxidizing a tire internally would be quickly used up by the limited O2

This article here suggests that the physical size of N2 and O2 molecules is very similar

.getnitrogen.org/pdf/graham.pdf

Or was that R134 molecules being a different size? I'm getting my gasses mixed up. If you think about it, a air compressor uses regular air from the atmosphere and compresses it. If compressing air reduces the nitrogen without a special designed compressor, you should have 78% nitrogen in your tires anyway.