Originally Posted by
SwampDude
Is there some reason you object to CO2 when you're away from the floor pump? If you have a gauge that works, seems like getting the desired pressure should be doable.
As a routine method of topping up tire pressure, CO2 is a very poor and expensive way. First, even unthreaded 12 gm cylinders in 25 count boxes are about $.50 each and second, CO2 "leaks" (more properly diffuses) out of innertubes significantly more rapidly than air so you will have to top up the pressure even more often that with a pump.