Answered How much gas inside a Co2 cartridge?

[Beekeeper]

Just out of interest, what size canister would I need to inflate a 29inch 2.6 wide tyre to say 40psi which is the maximum allowed? I’ve never used one and don’t even know if they come in different sizes

 

[Gary]

2 canisters

They do come in different volumes but for that size tyre and that pressure you'll still need 2 no matter whether you use 16g, 20g or 25g canisters.
16g are usually most cost effective. especially if you buy in bulk

 

[Funkeydunk]

I used a 25gm canister on my 29er 2.6” Maxxis Minion and it inflated to 29 psi.

 

[steve_sordy]

I'm sure I read somewhere that some sealants (no idea which) react with the Co2 and go solid. I don't know whether this is a chemical reaction or just that the Co2 will be cold. Anyone else?

 

[Gary]

simply inflate with the valve at the side (3 or 9 O'clock position for us old codgers who can read an analogue watch) so all the sealant sits in the bottom of the tyre Steve and it's a non issue.
CO2 inflators actually specify this is how they should be used (if anyone actually read instructions)

 

[mark1a]

Something worth knowing about CO2 in bicycle tyres - once you're home again, you should let it all out and re-inflate with air. CO2 deflates through the tyre far more easily than air, and so if left for a couple of days, the tyre will be flat unless you replace it. However they are indeed great for quick repairs to get you home. I use 16g for my road bikes and 25g for my MTB.