Threading a chuck onto the valve creates a mechanical seal that handles high pressures without blow-off, which matters when you're pushing road tires past 100 psi or seating tubeless beads. The ABS-1 PRO Chuck from Lezyne threads directly onto valve stems using the cap threads, eliminating lever-clamp systems that can slip under load. The threaded connection distributes pressure evenly around the valve rather than concentrating force at clamp points.

The flip-thread design switches between Presta and Schrader by unthreading the chuck from the brass swivel, rotating 180 degrees, and threading it back on. Each end of the chuck body machines to a different valve interface. The 90-degree bend positions the hose connection perpendicular to the valve axis, keeping the hose from interfering with spokes or frame tubes while you pump. That bend also reduces lateral stress on the valve stem compared to straight in-line chucks.

Machined aluminum forms the chuck body while Composite Matrix material reinforces the flip mechanism and valve interfaces. The brass swivel between the chuck and hose rotates smoothly without binding, preventing the hose from twisting into positions that put torque on the valve. An integrated Presta valve core wrench sits on the chuck backside, giving you the tool needed to tighten loose cores before pumping or remove cores for tubeless tire seating.... Read More