Nitrogen is unnecessary. Who cares if the tires expand at an inconsistent rate? I don't have any wild chicanes on my commute.
I have had issues with water vapor as it tends to condense into the beads of my rims. A moist, oxygen rich environment has caused seemingly perfect rims to corrode from the inside out. A water filter on an air compressor would solve that issue, though.
Running lightweight gas is pointless. I'll take small gains, but saving 3 grams in rotational mass is futile.
- LostCause