I know some say it is Great and some say it's a Waste of time. On some topics I have to see the results with my own eyes. Nitrogen happens to be 1 of those topics.
The main questions I had regarding Pure Dry nitrogen were:
1) Will the tires experience less of an increased of pressure after the tire gets hot and if so by how many psi.
2) Will the tires experience less loss of pressure over time (months) due to the fact that nitrogen molecules can not pass through rubber as easily as oxygen.
3) Will I experience less corrosion at the bead area of the rim due to the nitrogen being dry and without any trace of moisture.
6 month test running pure (99.99%) dry nitrogen. Tires were repeatedly purged to completely replace standard compressor air. New scradder valves were installed in each tire valve and metal "o" ring caps were used in place of standard plastic valve caps. Tires tested were both Dunlops. D401F front & K591 rear. In the course of 6 month, 5,400 miles were driven.
Results I recorded on my set of tires.
1) After tires got Hot, pressures did not rise as much as air but did rise more than I expected.
Using Air Cold 30 Front 35 Rear. Hot would be 34 Front 40 Rear.
Using Nitrogen Cold 30 Front 35 Rear Hot would be 32 Front 38 rear. There was a reduction but I was really expecting better.
2) I was shocked with the loss of pressure over time. The loss of nitrogen was almost the same as standard air. It was maybe a little better than straight air but nothing like I expected it to be. After 3 months, I had to top off both tires with more nitrogen because the cold readings were low by 3 psi. I was expecting a lot better results.
3) Pulled off my tires today to change brands and had the same bead area corrosion just like I had many times before with aluminum or mag wheels. I know the inside of the tires were dry, so it must not really be corrosion due to internal moisture.
So to sum it up for me, I certainly would not pay extra or go out of my way to obtain nitrogen. But if it was free and there for the asking I probably say "go ahead".