Tyres

[alex k]

You can't beat Boyles law. You warm up a gas then it expands. If it's confined in a fixed volume such as a tyre then the perssure will increase. It matters not a jot if its air, nitrogen, argon or even fart gas.

[dennis.doyle]

but only in the hypothetical world of ideal gases.

Anyway, as mentioned above, it's not just the type of gas but the moisture content that matters. You wouldn't want ice crystals rattling around in there on say Oct 24th would you?

[SteveSlowboy]

Grant, from what I can fathom, the main reason for folk using a cylinder of nitrogen is that it's dried when being pumped into the cylinder so you've removed he water content.

Helium may be light, but with the molecules being so small, You'd be forever pumping up the tyres! Would be interesting to corner weight the car with helium filled tyres. And an added bonus would the squeaky voice tricks after a few beers! Damn site more expensive than nitrogen as well.

[maycontainNUTS]

We used to run nitrogen in the tyres of the Darrian rallying, purely because the pressures remained far more stable, 1 or 2 psi rise per stage, as opposed to 5 or 6 with damp air. I would think it simply wouldn't be worth it for hillclimbs.