Originally Posted by Mc85
What's the beni for nitro in the tires. Call me a noob
Originally Posted by billt
Actually the main reason is that Nitrogen is less likely to migrate through tire rubber than air that is only approx. 75% Nitrogen. This means that tires filled with pure Nitrogen will hold pressure more consistently. This is very important in race cars, where the slightest change could effect a race cars handling.
That's the theory, though even "pure" Nitrogen still has some oxygen content.
In practice, assuming the tires have been installed correctly and are undamaged, the benefit is pretty low. Extreme driving is a different story, but most people won't get enough benefit to warrant the cost.
Of greater benefit is having the tires filled to the correct pressure from the start. This is something that isn't always the case when having tires changed.
Too often, tires are filled to the pressure listed on the side wall. Never, ever do this. That is the MAXIMUM pressure, not the recommended pressure. The number to use is listed on the inside pillar of the driver's side door, assuming you are using the correct tires for the vehicle. Further, the pressures listed are cold PSI, so check them before going anywhere, not when your out and about.
Over or under-inflation can seriously shorten the tire life and even increase the risk of blowouts. Further, over or under-inflation can wreck the bead of the tire, which can increase the chance of erratic tire pressures based on temperature.
Also, don't bump into curbs. When pulling into spaces, don't let your tires bump the curb or wheel stop. When cornering, make sure you don't hop a curb. While it seems obvious, I see it happen a lot. Doing this can pop the bead on a tire and result in frequent pressure loss, even in a brand new tire. It can also bend rims that will result in a poor bead on replacement tires. It can also put your wheels out of alignment.
Finally, avoid turning the steering wheel when completely stopped. Doing so not only stresses the tires from the friction, but can wreck your alignment. Gently creep forward or back while turning the wheel (depending on which direction you need to go) to take the stress off the steering. This was something you actually needed to do to steer easily before power steering was common. The motor may be helping you now, but the forces are still the same.
As always, poor alignment will also affect both tire wear and the forces working on them. Either one will affect air pressure at some point.
Just one more thing: don't forget to check the spare when putting air in your tires. I also recommend replacing the spare about every other tire change to avoid dry rot issues, especially on vehicles where the spare is stored outside the cabin.