Labor cost!
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#3
People still using Nitrogen in normal vehicle tires? I remember when this was all the rage a few years back. Your the first time i seen use it since then. I didnt notice sod all difference when i used to it so went back to cheap old compressed air lol
#4
I'm currently looking for wheels that I can put on as soon as the truck is built, but most places I see have free mounting and balancing along with a nitrogen fill if you buy wheels and tires.