Sadieme, yes the Co2 canister is under very high pressure and you use that instead of pumping air to fill up your tube. Some canisters must screw onto your Valve stem (so you need to know whether your stems are Presta or Schrader) or come sort of clip on using a special trigger activated "gun". pumping air into a tube on the side of the road with mini pumps like you would carry with you is difficult because those pumps are so tiny. They don't pump as much air as a floor pump. So Co2 with a trigger device that attaches to the valve takes like 1 second to inflate a tire. The downside is that if you get a bunch of flats on a ride and run out of cartridges. Some folks carry both.



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