I carry a frame pump on the bikes that will fit one. When I'm on the ones that won't, I carry 2 CO2 cartridges, an inflator, AND a minipump. The minipump works, but it takes FOREVER to fill a 28mm tire! OTOH, every time I've depended on CO2, I've blown out both cartridges and gotten no inflation. I probably should practice using them before I need them, I guess.
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