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We use nitrogen in the aircraft I fly. The temp ranges these tires go through are from -54 degrees C at altitude to maybe 150 degrees C with hard braking. I have always been told that we use nitrogen because it is a dry inert gas and will not hold moisture, and thus there is less chance of rust or corrosion developing inside the wheel. I have also been told that nitrogen maintains the pressure better through temp extremes. We also use nitrogen as the pre-charge on the gear struts and all sorts of hydraulic accumulators.
All jet aircraft use nitrogen in the tires and accumulators, so it can't hurt anything. But $24?
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