Nitrogen an Oxygen the two biggest components in air actually have about exactly the same specific heat ratio, so the heat pressure deal doesn't really fly, you get rid of the O2 you do get rid of the corosion factor of O2, but not many tires corode, without any O2, I guess you would also have a safer tire, no O2 to support combustion, as long as it's in the tire. I work in the natural gas biz, I've seen that used in a pinch out in the field, but it's allways best to warn the guy fixing that tire. LOL