Here Mitch hold my tin hat for a second...I'm really avoiding this because I'm sure there are GP teams intensely awaiting a discovery but...Originally Posted by Mitch Williams
"air" = ~78% nitrogen
volume inside the bead sealed tire doesn't change (negligibly) and the gas volume required to raise the pressure from standard to operating doesn't quite double so unless you have a vacuum in the sealed tire before filling with gas you're never more than ~90% nitrogen. Which is probably a good starting point for negotiations at the tire shop when they offer it for an extra charge. If any of this is wrong I don't want to know it because it plays no bearing on selling smoothies.
In summary, put an appropriate amount of air in your tires and go ride.
Now give my hat back Mitch.
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