Is anyone using Nitrogen in their tires?
audi at humanspeakers.com
Thu Jun 12 10:01:13 PDT 2008
> 2. For long term storage keeping the rubber surfaces without
> oxygen might reduce the rate of surface oxidation for the tires.
> This might be of value if long-term is interpreted as meaning
> multiple years. Of course, filling the tire with nitrogen will help
> keep oxygen away from the interior of the tire but will accomplish
> nothing for the exterior surfaces.
It's the outside of the tire that takes a beating anyway. Next time you
get a chance, look at the inside of a worn-out tire.
And what makes leaks is corrosion on the outside of the rim working its
way under the bead, usually only a problem in the salt belt.
> From what I read, the biggest advantage of N2 in the tires is that it
> is DRY, so it's more stable (no phase change of H2O) when it heats
> I was always told nitrogen was good (moreso in high performance
> situations) because it was dry. Water vapor changes pressure a lot
> more under changing heat loads, e.g. at a track.
This would only be an issue if, as the first quote above says, there is
a phase change. Water/ice take up a lot less space than vapor. If your
ambient temperature is at least as high as when the tires were filled
(and the compressor had a simple trap), any H2O in there should be vapor
already - a gas. And all gases expand at the same rate with temperature.
> Why else do racers use nitrogen in their tires? Well, compressors
> aren't allowed on pit lane, so they already have large, high pressure
> nitrogen bottles to run the air tools and jacks. That's how it
> started, surely, then they discovered that their tire pressures were
> more stable.
I think this one hits the nail on the head. Racers already have
nitrogen handy, so they put it in their tires. Don't you want to use
what racers use in *their* tires???
IMHO, what's more important when mounting tires is cleaning the rims
carefully, and using plenty of the right sealing compound on the bead.
It takes a few minutes, but its worth it in terms of avoiding slow leaks
from the get-go.
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