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Originally Posted by Tool Pants
Air is about 80% nitrogen. The oxygen molecules in air are smaller than the nitrogen molecules, so the oxygen escapes from the tire faster.
So if you fill your tires 120% the oxygen molecules will escape and you are left with 100% nitrogen.
Free nitrogen for your tires....
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but you'd still have moisture in the tires. elimination of the moisture is the primary reason for filling tires w/ dry nitrogen.