Waste of money and effort. Just a way to get you to pay for something that is insignificantly different from what you can get for free.

Air is 80% nitrogen. Nitrogen is pretty inert and doesn't explode under any circumstances.

exactly thank you

Nitrogen is actually lighter then O by about 2 AMU's (highly unstable form, will almost immediatly become O2 making N 18 AMu's lighter) so it should diffuse out faster (unless somehow the tires prevent diffusion of N).

However Oxygen does have a much great electron affinity then Nitrogen which is probably the reason it is used.

Also i think Nitrogen would have a lot more energy when rupturing a tire as it'll have more Moles/litre.

wow im speechless are u some sort of chemist, if ur not i would just stick with the advice from tire companies saying it is safe.

More like a chemist in training. However, I've done NO work with tires.

What I said doesn't mean nitrogen is not safe. While O2 may be desner the atmoshpere carries water and other gasses. The water in teh tires (while miniscule) could condense and then freeze over night at one spot in the tire and offset the balance of the tire, but I"m pretty sure the tire woudl heat up fast enough to melt or vaporise the water, but increased pressure = lower freezing temp.

But I think TG was rigt about larger force when exploding. However I don't think it's enough of a difference to be especailly noticable.

If you remember the equation Pressure = Force/Area (not the best example but I just woke up). Nitrogen will provide more area then O2 will meaning you'll need more force. How much more I don't know, but I'm sure there's a good reason we don't use Heluim in tires. I can dig up my old pressure equations to give you a better answer regarding this if you want.

Anyone know how much thermal conductivity comes into play inside a tire?
Probably won't mater as nitrogen and air have a similar thermal conductivity.