The Muc-Off Big Bore Lite in XXXL (80mm) is the pinnacle of tubeless valve technology, designed specifically for those running the deepest aero rims on the market. This isn't just a longer version of a standard valve; it is a total redesign that eliminates the century-old Presta core. By replacing the restrictive internal pin with a straight-through "Full Bore" design, Muc-Off has removed the #1 cause of tubeless setup frustration: sealant clogs and restricted airflow.
Finished in a head-turning Iridescent (Oil Slick) coating, these 80mm valves are engineered to clear deep-section carbon rims (65mm to 75mm+) while providing a professional, "extender-free" look. The integrated stainless steel ball valve is operated by a simple external lever, allowing you to blast air into the tyre to seat the bead instantly, then flick it closed with zero air loss.
XXXL 80mm Length: The longest valve in the Big Bore family, specifically designed to provide ample clearance for ultra-deep aero wheels without the need for leaky valve extenders.
Coreless "Full Bore" Design: Offers a completely unobstructed path for air, providing up to 230% more volume than a standard Presta valve—perfect for seating stubborn tyres with a floor pump.
Lever-Operated Ball Valve: Features a precision-engineered on/off lever for instant airflow control. No more unscrewing tiny cores or dealing with bent valve pins.
Zero-Clog Technology: Because there is no internal core for sealant to "gum up," these valves remain free-flowing for the life of the tyre.
Direct Sealant Injection: The wide internal bore allows you to pour or inject sealant directly through the valve stem without popping the tyre bead or removing a core.
Iridescent "Oil Slick" Finish: A premium, multi-tonal anodized finish that shifts from purple to blue to gold, making it the ultimate "bling" upgrade for any custom build.
| Feature | Specification |
| Valve Type | Big Bore Lite (Presta Pump Compatible) |
| Size | XXXL (80mm Total Length) |
| Material | 7075 CNC Aluminum / Stainless Steel |
| Airflow Increase | Up to 230% vs. Standard Presta |
| Color | Iridescent (Oil Slick) |
| Weight | ~30g per pair |
Ultra-Deep Aero Rims: If you are running 70mm+ deep wheels, the 80mm length ensures the lever and pump head are easily accessible, providing a much cleaner look than using extenders.
The "Bling" Factor: Perfect for riders who want their bikes to stand out; the Iridescent finish is the most popular way to add a high-end, custom pop to a carbon wheelset.
The Tubeless Perfectionist: If you want the fastest possible bead seating and a valve that will literally never clog with sealant, this is the final word in tubeless hardware.
Low-Profile Rims: On a standard 30mm alloy rim, an 80mm valve will look awkwardly tall and is more likely to be bumped or damaged. For shallow rims, the Medium (35mm) version is a better aesthetic fit.
Subtle Aesthetics: If you prefer a "stealth" look, the bright Oil Slick finish might be too loud for your build. You may prefer the Matte Black XXXL version.
When installing the XXXL Big Bore Lite, ensure the locking nut is snug but only hand-tight. Over-tightening a long 80mm stem can put leverage-stress on the valve hole of a carbon rim. Because the bore is so wide, you can use a Muc-Off Sealant Dipstick (or even a thin zip-tie) to check your sealant levels through the valve—no need to break the seal of the tyre! Finally, if you're using a digital pressure gauge, the ball valve allows for incredibly precise "micro-adjustments" of pressure—just flick the lever for a split second to bleed off exactly 0.5 PSI at a time.
