I may have sent a few too many of the cartridges!
It was a good thing you did because the larger one I thought I needed turned out to be too big but the smaller (16g?) one fitted perfectly. Thanks again!
Playing devil’s advocate here, wouldn’t you still need to take a co2 cartridge as well if the tyre bead came of the the rim or you needed to reinflate after fitting a tyre boot say?
You’re right, this is primarily so that I can go without any pack or bag at all on shorter (~2hr) rides. As well as the pump I’ve got a multitool that fits in the crank axle and some bacon plugs which fit in the handlebar end. I’m accepting that there’s still potential for walking home because the walk wouldn’t be that long.