Nitrogen has a small place in road car tires. A very low profile tire changes foot print with a mere 1 psi change. Air will yield a 3-5 PSI change at 140 degree operating temp while N will yield less than 1. But how performance does a road car need to be? My GTO has less than 2" of sidewall - it does tend to eat the edges of the tread if not driven hard enough to give all the body roll it can make.
If you ARE getting strange wear on the very low profile tire simply get the correct footprint HOT, allow them cool and check PSI cold. That becomes you new cold PSI. And then simply maintain a habit of checking weekly (or monthly) to maintain cold PSI at ambient seasonal temp.
Nitro in a passenger car tire is so the little old lady who NEVER checks her tires doesn't get panicked by a "low tire" warning in the fall when ambient is 20 degrees lower than summer so her tires loose 5 psi cold!
J Wm Bishop EA, ASADE
The wagon should, of course, be as light as possible, but strength should not be sacrificed to lightness, for on any but the regularly traveled roads, the wagon will get many a
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