Deflator for bicycle presta valves - quick release

thingiverse

Quick release deflater for Presta valves commonly found on bicycle wheels. Unscrew the Presta valve locknut and push this piece on; it will hold itself in place while holding the valve open, allowing the tire to deflate while you do other things. Press the button to open it up and remove it. Despite having M6x1 threads, it still grabs a smooth valve shaft securely enough to keep those valves open as well. It's useful to have at least two printed if you're working on a bike where maintenance is done to the tires, such as refreshing tubeless sealant or swapping tires. Once the bike is in the stand and the Presta locknuts are open, pop one of these on each tire valve and this will deflate the tires while pulling the wheels out of the frame. This can also be done with a Presta valve cap if you cut off the very end, but that has to be threaded on, which is more work. See also the original version for Schrader valves (complete with misspelling of "Shrader"). Is it a deflator or a deflater? Sure, whichever.