Originally Posted by Robinho
I carry 2 CO2 canisters in my saddle bag with a spare tube, the only time I have had cause to use one so far i messed up and attached the valve adaptor while it was open and let most of the Co2 out, rendering it pretty much useless, hence why I now carry 2. No pump tho, just some tyre levers, Allen keys etc. It is much quicker and easier process than trying to get 80-100 psi into a tyre with a hand pump, less of an issue on an MTB. Worth noting the advice is to replace the Co2 with fresh air when you get hone, although I don't know what the science behind that advice is!