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Ah ok, I understand now for the max pressure issue.
As for the nitrogen, it can make some difference to run strictly nitrogen in the tires. Intuitively it doesn't make alot of sense to say that changing the composition from 80% to 100% makes a difference but it does. . . a little.
Its not going to be huge, but the reason it will influence it is nitrogen is more compressible than oxygen by a good deal. Ideal gas doesn't really hold even close to accurate for atmospheric air because the pressure reduced for atmospheric air is much higher than 14.7 psi, 1 atmo. Nitrogen on the other hand has very lovely properties because its pressure and temperature criticals put its compressibility at air temp and pressure almost right on the money to use the ideal gas equation.
Oxygen starts trying to react with its neighbors in air especially when it gets compressed or heated and it causes the volume to become less isentropic.
At tire pressure nitrogen is not dead on for a compressibility of 1, but its not very far off still. Its mostly a function of temperature not pressure. That said the only difference its going to make is if you get the tires toasty to start with the air tires won't dissipate heat as quickly as the nitrogen ones, they also will have a greater pressure at a given temperature. For ultime tire performance nitrogen would be preferred to keep pressure impact loading on the tire down and decrease the fatigue stress on the rubber.
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