4.0 diameter bypass shocks provide additional damping and cooling capabilities over smaller options

FOX OFFROAD 40 FACTORY BYPASS DETAIL 2 146x220 FOX 4.0 Factory Series Bypass Now AvailableNow available, the FOX 4.0 Factory Series Bypass shock is the ideal position-sensitive shock for lightweight unlimited offroad racecars and pre-runners.

Bypass shocks allow precise adjustment of multiple stages of compression and rebound damping. The 4.0 Factory Series Bypass shock adds another competitive option to FOX’s already extensive bypass shock lineup. The expanded volume provides a wider damping range and increased cooling—optimizing the suspension and increasing the vehicle’s capabilities. The 4.0 Bypass shock uses the same extended and compressed lengths as the 3.5 Factory Series Bypass for easy upgrading. Read More→