Yes they are available and aren't limited to racecars. I've used them and didn't care much for them. Just one more thing to go wrong. I learned in racing that consistency was more important than horsepower. I've used nitrogen for years in my racecars mostly because I could predict the growth of a tire with heat added. An aired tired depending on the source could easily gain 4-10 lbs in just a few laps on a 1/2 mile asphalt oval whereas the same tire would gain consistently 2-3 lbs. I could predict that tire's circumference and consistency. I very rarely completely purged them probably could have had more consistency. Tire temps were 110 to 210 depending on position on the car. I've checked tire temps on my hauler and very rarely exceeded 110 degrees, treaded tires cool much better than racing slicks. I never saw a reason to put nitrogen in my vehicles other than when I had a soft tire on my hauler for the ride home. At such low temperatures they didn't grow that much and regular tires are much stronger to resist the growth.
Race car tires are considered springs and we would adjust the rate by added air or nitrogen to change that, as well manipulated their growth. I have also used air to quick grow a tire sometimes when I couldn't get a tire the exact size I wanted.
The other reason for nitrogen at the race track was that most times it was much easier to cart that bottle and hose hookup than a separate compressor, we also used it for our impacts because you could crank up the pressure and super charge them for quick tire changes. good portable supply for all air tools.
I believe that marketing people used these advantages to get customers to the doors of the tire dealerships. I won't say that it is bad thing to use because it's not but IMHO I don't believe that it is that much of an advantage.
If the focus is on moisture in air then why won't they just invest in air dryers that have been proven to remove most of the moisture. That's what most racers use now as well as air bleeds, which are not allowed in all classes of racecars.
Other methods have come to pass such as vacuuming a tire which I understand to be quite dangerous and has been banned by Nascar and others
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