Quote:
Originally Posted by ThunderMoose
According to the ideal gas law there is no difference between Bone Dry Air and Nitrogen in how the pressure responds to changes in temperature. The real difference is that air contains trace amounts of water which condenses at cooler temperatures and could have some marginal impact on pressures. This is more of any issue with airplane tires where water will freeze in the tires at altitude.
As for me, I'll continue to run my custom 79% N2 / 21% O2 mixture.
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This is correct, the only point in inflating tires with "nitrogen" is to avoid having water in the tire. Water has a great impact on tire pressure because the condensation/evaporation point is right between the cold and hot tire operating points. As Hack mentions, the tire needs to be properly purged, i.e. all traces of water/water vapor removed from inside the tire, for the nitrogen fill to be effective.
This is too much trouble for marginal benefits for me and I will also stick with normal air.