Originally Posted by rdtompki

Seems like the Nitrogen might be more of an attempt to extend the time between having to air up those gigantic tires. Unless your moving earth on the moon the earthmover is surround by the same air that is ordinarily in the tires. Marketing ploy maybe?? In terms of the tire exploding when it gets hot I'd think the Nitrogen would expand at approximately the same rate as "air" (which is mostly Nitrogen anyway).