Muc-Off Big Bore Tubeless Valve Stems

By removing the traditional valve core, the Big Bore system allows for 230% more airflow. This massive increase in volume makes it significantly easier to seat stubborn tubeless tires with a standard floor pump, as the air enters the tire much faster.

Yes, the base of the valve features a 4-way channel design specifically engineered to maintain airflow even when pressed against tire inserts. It is compatible with most major insert brands on the market.

Instead of depressing a pin, you use the integrated external lever on the valve head. Simply flip the lever to open the internal ball valve, allowing air to flow freely for inflation or deflation.

These specific stems are 45mm long and are optimized for rim depths between 25mm and 30mm. If your rims are significantly deeper, you may need a longer valve stem to ensure the head clears the rim bed.

Yes, that is a primary benefit. Standard Presta valves have narrow openings that easily gum up with sealant, but the Big Bore's wide-open ball valve design allows sealant to pass through without obstruction, keeping your airflow consistent over time.

You only need a 4mm hex key to tighten the valve into the rim. The base is machined with a 4mm slot, making installation and removal straightforward and secure.