Originally Posted by BarryD0706
Yes it will. Any gas will increase in pressure when it gets hotter. A normal trailer tire will increase almost 10psi when it gets hot. That large amount is probably due to the moisture that was in the air fill. (A nitrogen fill may have less moisture so may have less of a pressure increase.)
check your tire increases next time out, highly doubt you are seeing a 10psi increase in pressures even loaded close to max tire capacity. It also (as some stated above) won't leak down as fast as tires filled with o2. (a benefit for those less than religious about checking before every trip !)
And i would respectfully disagree, nitro doesn't expand close to the rate/amount that o2 does. Even our roadrace motorcycle tires that deflect in shape a good amount, and reach surface temps of 200+F (with inner temps of 290+) only increase about 5-6psi if we have the correct compound, and 8-9 if we have way too soft a compund that is literally getting "greasy" at the end of a session.
lots of info out there on this. i should have perhaps amended my post to say ".. not as much as o2".. on of many articles out there doing a quick goodle search
Nitrogen vs Air In Tires - Why Nitrogen in Tires - Popular Mechanics