Digressive Piston With O-Ring

The Digressive Piston With O-Ring from FOX FACTORY INC is a precision damping component specifically designed for FOX suspension damper cartridges. This compact piston assembly is ideal for riders and mechanics who require consistent shock response across varying terrain and driving conditions. Whether you're upgrading a full-suspension mountain bike, all-terrain vehicle, or high-end off-road truck setup, this FOX damper piston provides the controlled force management that distinguishes premium suspension from economy alternatives.

The digressive piston design allows the damping curve to soften as velocity increases, providing compliance during small-bump impacts while maintaining support under aggressive compression events. The integrated O-ring seal ensures consistent oil containment and pressure regulation within the shock body, preventing external leakage and maintaining damping curve consistency over extended service intervals. At just 0.06 lbs, this lightweight assembly minimizes rotating mass, and its engineered geometry—measuring 2.2 inches tall by 0.65 inches wide—fits precisely within FOX's sealed damper cartridges.

Mechanics and suspension technicians rely on this OEM-spec piston for routine maintenance, rebuilds, or upgrade projects on FOX Factory suspension components. The O-ring cross-section provides superior durability compared to standard seals, resisting thermal cycling and maintaining elasticity in extreme temperature environments. This product is essential for anyone looking to enhance the performance and reliability of their FOX suspension systems.