I have been very satisfied with the Xlab Microflate CO2 chuck that I currently take with me on the bike. It is small, light, and simple to use. My only complaint is that..at least for me...the twist-to-inflate method can be a little tricky. Basically, you insert the CO2 cartridge into the chuck and screw it all the way in to pierce the cartridge. Then you back it off a quarter of a turn to release the pressure and inflate the tire. More than once I have turned the cartridge a little too far and wasted some of the CO2. So, when the seal degraded on my Microflate, I went shopping online and found the Genuine Innovations Air Chuck Elite. It appears to be manufactured by the same company that supplies Xlab. It is also small and light, but employs a push-to-inflate method where you completely seat the cartridge to puncture it, then press the chuck against the tire to inflate. When you release the hand pressure on the chuck, the flow of compressed air stops. To me this is the preferred method. If you don't mind the twist-to-inflate method, the replacement for the Microflate seems to be the Nanoflate, which is about $5 cheaper than the Air Chuck Elite. They both work on Presta and Schrader valves and use threaded CO2 cartridges. One thing that I wish they had retained from the Microflate chuck is the threaded nozzle which actually screwed onto a Schrader valve. Obviously it's not necessary since plenty of pumps and CO2 chucks don't have it, but it was something that I liked about the Microflate that I wish they had retained. Other than that, the Air Chuck Elite is my choice for CO2 inflation.
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