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Nitrogen will expand and contract... however, not to the degree of plain old air. So for example during an autocross session, you start when it's cooler out and after a few runs your tires are hot and when you finish later in the day when it's even hotter your tires will go up several PSI. Nitrogen will only go up a few PSI. I'm not good enough to worry about tire pressures yet but all the better drivers are constantly fiddling with theirs
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