Quote:
Originally Posted by xenon
Can't see it. Air is 80% N2 anyway and O2 & N2 have the same specific heat capacity and O2 is slightly more dense at the same temperature. This could make a tiny difference to expansion (but tiny) and if you fill your tyres with air it's 80% nitrogen in the first place.
It really is snake oil, as Del said.
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Motorsport have used nitrogen for decades because it doesn't expand or contract between hot or cold (well, very little anyway), so the set pressure stays the same throughout the operating temperature.
That's why F1 down to go karts use nitrogen in their tyres.
Using regular air, even in a road car, your pressures can easily increase by 5psi when warm compared to when cold. Thats why you have to fill them cold so you don't run the risk of underinflation if you filled hot and then they cooled.