Hmmm, but does the gas inside a tire rotate with the tire?But it's "rotational weight", so every gram counts :wink:
What he said. It should also be noted that nitrogen compresses less than air, but that is minor. Add that that air is 78% nitrogen. In theory you could add a moisture filter/removal component to your air compressor and get the same result.The reason for nitrogen is that it is dry. Condensation/vaporization of water from air can cause fluctuations in pressure. On a car that will more likely operate under a wider array of temperatures and will potentially be going 70+ mph it's of a much larger (though still not large enough for me) concern.