Tubeless Systems
Unlike Schrader cores, the inner parts of the valve, the valve core, of standard Presta valves often cannot be removed from the stem. Since the core usually has to be removed to use a tubeless or Universal System Tubeless (UST) setup so that tire sealant may be added, removable core Presta valves have become more common.
Read more about this topic: Presta Valve
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