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You may put 100% nitrogen into your tires, but it probably won't remain that way. Reason is Dalton's law which tells that in a gas mixture (air), each gas acts independently. So, oxygen and other gases are slowly working their way into the tire and the nitrogen is slowly trying to work its way out until the pressure of each gas is the same inside the tire as it is outside the tire. Having said that, it seems to me that the permeability of the tire/ rim/ and stem would determine the final outcome.
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