Muc-Off Big Bore Lite XXlarge Tubeless Valve Pv 70mm

Seat stubborn tubeless beads faster and fine-tune pressure with one hand. The Muc-Off Big Bore Lite features a coreless, straight-through Presta design that delivers up to 264% more airflow than traditional Presta valves, allowing tires to pop into place quickly and requiring fewer strokes for top-ups. A lever-actuated ball valve enables you to micro-bleed or fully open the airway without removing a core—perfect for adjusting pressure on changing terrain. Built to resist clogging and to work seamlessly with sealant, this 70 mm stem (100 mm total length) is ideal for deeper rims; the Lite version is compatible with standard Presta pump heads you already own.

- The coreless, straight-through Presta pathway provides up to 264% higher airflow, speeding up tubeless setup and reinflation
- A lever-controlled ball valve gives precise, on-the-fly pressure control—bleed a touch for grip or open wide to seat the bead
- Sealant-friendly and clog-resistant internals help prevent blockages that slow inflation or adjustments
- The 70 mm stem (˜ 100 mm total) is ideal for 50–55 mm rim depths, keeping pump engagement easy on deeper road/gravel wheels
- The Lite version is Presta-pump compatible, no special chuck required
- Optimized for MTB, gravel, and road tubeless systems, where higher airflow and quick pressure tweaks make a real difference

Specifications
Brand: Muc-Off
Model: Big Bore Lite XXL
Type: Tubeless valve
Valve Type: Presta (French)
Size: 70 mm
Material: Aluminum
Color: Red