Quote:
Originally Posted by donot521
Just got new tires from costco and they filled up with nitrogen. This is the first time I got tires with nitrogen and I heard I can't fill up with regular air if I have low tire pressure.
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1. Normal air is 78% or so nitrogen, yes you can top it up with regular compressed air
2. Costco nitrogen systems are dry, no water gets into your tires unlike a normal compressed air setup
3. Tires are filled up with nitrogen, purged down to 5psi and once again filled up. *edit* tank purity is 97% minumum, tire purity is 95%
4. Nitrogen does not expand and contract as much with heat compared to air
5. Nitrogen does not permeate the rubber as much as air, less bleed through over time