4 Grand Master
Air is like 80% nitrogen... but oxygen is the variable that expands when heated up... so hot tire always has more PSI... same for super cold winter and PSI falls.
Pure Nitrogen is more stable and used by all racing cars. They can't have tire pressure changing on them while racing.
I never used it... didn't want to pay for it.
Major Contributor
that why you buy your tires at costco!Originally Posted by Tiger
especially when they have 70 bucks off 4 tires!
free rotation
free flat repair
prorated tread wear if you wear your tires below the warranty
and so much more
only crappy part is that the wait might be a long time cause they are always busy =/
4 Grand Master
Yeah, I know all about them. Last time I went there, they told me they are not allowed to install anything other than OEM size tires... so that was the last time I went there because immediately I convinced my uncle to go 50/50 on tire mounting machine for his garage shop and I do my own tires since then.
Tire will lose pressure no matter when so I don't want to drive over there and have them top it out... They are probably a stickler too for OEM specified tire pressure too and I don't want to run them low either. I'd just start up my little compressor and done in 5 minutes.
As for tire wear and warranty... I never bother for that. In my experience and my driving habit... tires last longer than usable lifetime...years and I'd rather try other tires when the years comes up.
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