Exactly one year ago today, we reported on the launch of Muc-Off’s unique Big Bore Tubeless Valves. With a ball valve in place of a standard valve core, Muc-Off claims the patent-pending Big Bore design won’t clog with sealant while providing “turbocharged bead seating” with up to “264% more airflow.”
The Big Bore Valves are offered in three styles: Lite (Presta pump, Presta rim), Hybrid (Schrader valve, Presta rim), and Ludicrous (Schrader pump, Schrader rim). For the past year, the Lite version has been offered in three lengths — Small (30 mm), Medium (35 mm), and Large (45 mm) — while the Hybrid also comes in XL (60 mm). The Ludicrous version has yet to actually hit the market, but it is reportedly still in the works.
Big Bore Lite: New Sizes
Now, Muc-Off is making the Big Bore Lite (Presta pump, Presta rim) in additional XL (60 mm), 2XL (70 mm), and 3XL (80 mm) lengths to fit deeper road and gravel rims. This makes it possible for riders running 30 to 68 mm deep rims on their road and gravel bikes to enjoy the claimed benefits of the core-less Big Bore Valve design.
Compared to a standard Presta valve, the Big Bore Lite reportedly allows up to 230% more airflow. When the patent-pending Big Bore ball valve is opened, it allows completely unimpeded airflow through the valve stem. There’s no valve core to slow down airflow, remove when adding sealant, or get clogged over time. All you’ve got to do is turn the ball valve to open and close it. The system really makes a lot of sense when you think about it. Apparently, the innovative design of the Muc-Off Big Bore Valves recently earned them a 2025 Eurobike Award.
Big Bore Lite: Pricing and Sizing
Made from CNC-machined aircraft-grade 7075 aluminum with a stainless steel ball valve, the Big Bore Valves sound and look quite durable. At $50 a set, however, they don’t come cheap, but they are priced competitively with other premium valves on the market, like the Reserve Fillmore.
The standard Small, Medium, and Large sizes come in six color options, while the new XL, 2XL, and 3XL sizes are offered in four. Those four colors are black, iridescent, red, and pink. All colors and all sizes sell for $50 or £50. If you’re not sure what size you need, Muc-Off’s size chart is a good place to start. There is also a size selector on the Muc-Off website, where you can search by brand and model to ensure compatibility.
Big Bore Lite: Availability
You can learn more about the Big Bore Valves or purchase the new longer lengths directly through the Muc-Off website. Otherwise, the standard, shorter lengths of the Big Bore Lite valves are available at Muc-Off’s online and brick-and-mortar retail partners, with the longer sizes coming soon.
