Bought one of those CO2 inflators because "logic" and advertising told me they were lighter, more compact and quicker to use. It was one of those inflator/mini pump combos. Seemed like a good idea at the time. Here's what I learned: filling your tire with the CO2 will work until the CO2 leaks right through the tube and you are down on psi again. The mini pump is more mini than pump. The threaded cartridges are pretty expensive. There is a possibility that the CO2 cartridge can blow the chuck right out of the inflator head destroying your inflator's metering mechanism. Happened to me yesterday at mile 32 of a 52 mile ride. From now on there will always be a frame pump on my bike.