Have used these kits to repair punctures 3 times now, always in the middle of nowhere and always on a tire that was nearly due to be replaced.
The 3 large cylinders will give about 25 psi in a typical 180 x 17 tyre which is a "get you home slowly" situation. However, if the repair is given plenty of time to cure, it will take more pressure than that. My 2nd puncture repair was on the Whangamomona Road and when we got to Taumarunui, the bike shop didn't have a socket big enough to get the rear wheel nut undone. I wasn't prepared to let them have a go with a crescent, so we (2 up) rode the bike home via Reporoa, We did over 500km on the repair. However, the tyre was actually at 40 psi because I worked out that the CO2 applicator in the kit will actually take smaller cartridges - it just needs something for a bit of packing down the bottom of the holder; in this case, a 12mm tap washer. The reason I have done this is, that you can go down to your local sporting goods shop and buy the CO2 cartridges that are used in air pistols and soda siphons etc etc for about $1 each.
So I carry about 9 of them, but then I have bags of room under the seat. Having said that, you can get 5 or 6 of them in the standard kit bag.
I may not be as good as I once was, but I'm as good once as I always was.
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