Fox Racing Shocks 981-25-406-C Factory Race 2.5 x 18 External Bypass 3-Tube Piggyback Shock Custom

The Fox Racing Shocks 981-25-406-C is a Factory Race Series 2.5 x 18 External Bypass Piggyback Shock built for serious off-road competition and performance applications. Engineered as a custom unit, this shock delivers race-proven damping technology in a robust, high-capacity package designed to handle the most demanding terrain.

The 2.5-inch body diameter provides increased oil volume over standard shocks, reducing heat buildup and fade during extended high-speed runs. The three-tube external bypass design allows precise, position-sensitive damping — tuning compression response across different zones of shock travel for superior control on rough, high-speed off-road surfaces. The integrated piggyback reservoir further expands fluid capacity, keeping temperatures stable and performance consistent lap after lap.

Key Features:

• 2.5-inch body diameter for increased oil volume and thermal capacity
• 18-inch stroke for extended wheel travel applications
• 3-tube external bypass configuration for position-sensitive, zone-tuned damping
• Piggyback reservoir for expanded oil capacity and heat dissipation
• Custom-built unit for specific performance or fitment requirements
• Fox Factory Race Series construction with aircraft-grade aluminum components
• Nitrogen charged for consistent, fade-resistant damping performance
• Rebuildable and re-valvable for ongoing tuning and maintenance

The Fox Factory Race line represents the pinnacle of Fox's off-road shock engineering, used by professional racers in desert racing, rock crawling, and extreme off-road events worldwide. The 981-25-406-C custom designation indicates this unit is built to specific valving or dimensional specifications, making it an ideal choice for custom suspension builds and race vehicle applications.