Tire inserts complicate the tubeless valve equation. Most valve designs trap air and sealant at the base when foam inserts press against them, making inflation a frustrating exercise in pump strokes and profanity. The Muc-Off Tubeless Valves V2 address this with six machined channels at the valve base that allow air and sealant to flow laterally around the insert rather than fighting against it. If you're running CushCore, Tannus, or similar foam systems, these valves actually work with your setup instead of against it.

The V2 designation reflects a material upgrade from 6061 to 7075 aluminum, the same aircraft-grade alloy used in high-end cranks and stems. The result is a valve that handles the torque of a lock ring without the thread damage that plagues softer aluminum stems over time. A 4mm hex slot machined into the valve body lets you hold the stem steady while tightening the lock ring, eliminating the spinning-in-circles routine that comes with smooth-body designs.

Rim profiles vary more than they should, and Muc-Off accounts for this by including three different rubber base shapes in each package. Curved bases seal against traditional rim beds, square bases match modern hookless profiles, and a larger diameter option handles oversized valve holes. The included o-ring and lock ring sandwich against the rim exterior, creating a dual-seal system that eliminates the slow leaks that plague single-seal designs.... Read More