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I think the whole nitrogen thing started because compressed Nitrogen is inherently 'dry'. Compressed air typically has moisture. Continual filling with moist air will cause condensation and the water can cause a mis-balance and rot from the inside.
All gases obey the gas-law and expand with heat.
If you are racing and constantly adjusting tires, a small bottle of nitrogen is cheap and more portable than a 12v compressor. its win-win.
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