Its not that you have N2 in there doing anything special, its that you *don't* have O2 in there causing oxidation (which decrease tire life). Any inert gas would work, I am guessing N2 is the cheapest (it is in air after all....) and I am not sure if thermal expansion between the gases is significant enough to worry about.
And rot probably isn't the correct term, when the anti-oxidating agents in the rubber are used up, outside treadwear is accelerated substantially. Basically the composition of the rubber changes.
Quote:
Originally Posted by Cr from Texas
Never had one rot from the inside using the 78% stuff out of an air compressor.
"Air is a mixture of gases, 78% nitrogen and 21% oxygen with traces of water vapor, carbon dioxide, argon, and various other components."
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