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Originally Posted by CoeCEO
Well.......
Nitrogen gas does not expand and contract due to heat as regular air does. So this is very useful in avoiding the pressure warnings in areas with cold winter seasons or extremely warm temperatures.
Also due to the molecular properties of Nitrogen, it does not escape from your tires like oxygen and other gasses found in air.
It is also an inert gas which prevents rim corrosion.
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No. All ideal gasses expand and contract at the same rate. PV=nRT
Leakage IS a function of molecular weight. The smaller the molecule, the faster the leakage. Nitrogen is 28, air is collectively 29, so it actually LEAKS FASTER than air.
Your last reason is probably the only one. With no oxygen, there is no oxidation. So the inside of your wheels will stay shinier.