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Old 08-25-2012, 05:47 PM   #3
Unkgd
Gnarly Adventurer
 
Joined: Apr 2007
Location: Central Coast,Ca
Oddometer: 343
Water vapor

Compressed air always contains moisture - which is the major contributer to rising tire pressure when the tire warms up.
Bottled nitrogen contains significantly less moisture (on the order of ppm if I remember correctly) hence - less pressure rise when heated.

It would be possible to use an eductor to remove the air from the tubes prior to refilling with nitrogen - which would save one step from what the OP did.

I have a bottle of nitrogen sitting in the hanger - might have to finally get arround to doing this
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