To use the basic Upgrade Set version of the device, you just remove the core of your existing Presta valve (and yes, it must have a removable core), thread the machined aluminum CoreCap onto the top, ...
If you’ve worked on a high-end mountain or road bike for any length of time, you have likely cursed the Presta valve. This humble century-old invention is the bane of many a home and professional ...
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