How often do you add air to your tires?

[mrlmd1]

That's got to be one of the biggest hypes going, like bottled water. Atmospheric air is 80% nitrogen anyway. Do you really think removing O2, CO2, argon, zenon, etc, etc, at great expense makes the "air" last longer and leak out less and ride smoother? Like it's much more dense or something?
Sounds like a lot of crap to me. And nitrogen coming out of a tank fast as it expands can get REAL cold, (liquid nitrogen is a few hundred degrees below zero as it becomes gaseous), and I would wonder about doing real thermal damage to the rubber in the tube and tire putting it in if they did it too fast.

Don't forget, our bikes have tubes in them, The rim strips prevent the spoke ends from puncturing or abrading the tubes, You would not get a pinhole leak of air if the tube had a hole in it from a spoke. You would not get a pinhole leak of air if the tube had been pinched and torn in inserting it. You would not get a pinhole leak from a nail or screw in the tire puncturing the tube. It would leak pretty fast and go flat if any of those happened, Once you get a hole in a rubber tube, the elasticity or pull of the rubber and the pressure in the tube would make the hole larger and leak faster. It is not the same as a nail in a tire. The most likely place for a slow leak to occur is in the valve - either screw in in tighter or replace it with a new one and the leak should stop. Should be pretty simple.