Muc-Off has reinvented its tubeless valves! The new Big Bore valves are designed for maximum airflow, featuring a coreless design that keeps them completely open. The revolutionary straight-through coreless design delivers up to 264% more airflow than traditional Presta valves. A lever-operated ball valve revolutionizes airflow control. No clogs, faster tubeless setup, and on-the-go tire pressure adjustment for any terrain and any conditions.