The Fox 38 Factory GRIP2 suspension fork is engineered for aggressive trail and enduro riding, delivering unparalleled stiffness and control. With advanced damper technology and a robust chassis, it’s a high-performance component that demands precise maintenance. This guide details the installation, adjustment, routine servicing, and optimization of the 38 Factory GRIP2, ensuring riders maintain peak fork performance and longevity.
Tools Required
- 32mm cassette tool
- Torque wrench [paid link] (2–40 Nm range)
- 10mm and 6mm Allen keys [paid link]
- Suspension oil (Fox 20wt. Gold and Float Fluid)
- Clean rags and isopropyl alcohol
- Syringe or suspension fluid pump
- Pick tool or seal driver
- Fox genuine seal kit and crush washers
Proper Installation Procedure
Installing the 38 Factory GRIP2 demands attention to interface tolerances and torque specs. Begin with an inspection of the steerer tube for burrs or deformation. Cut the steerer to fit your frame, then install a star nut using a proper setting tool. Mount the crown race using a crown race setter for even pressure distribution. Slide the fork into the head tube and secure with the stem, tightening the headset to eliminate play.
For brake and axle setup, route the hose neatly using factory guides and torque the caliper bolts to 6 Nm. The Kabolt-X axle should be torqued to 19 Nm. Double-check alignment of the caliper to avoid rotor rub. Finally, preload the headset and snug the stem bolts evenly to 5 Nm.
GRIP2 Damper Adjustments
The GRIP2 damper is a hallmark of tunability. It features both high- and low-speed compression (HSC and LSC) and rebound (HSR and LSR) adjustments. Set sag first, ideally between 20–25% of total travel. Adjust LSC to improve mid-stroke support and pedaling platform. Increase HSC to firm up fork behavior during deep compressions or square-edge hits.
For rebound, start with LSR. Tune it to avoid a bouncy or sluggish ride. HSR controls behavior after fast compressions—use it to reduce kickback in rough terrain. Fox recommends adjusting in increments of two clicks and testing changes on familiar trails.
Routine Maintenance Schedule
Regular maintenance is key to fork longevity and optimal feel. Fox recommends a lower leg service every 40 hours of ride time. This involves removing the lowers, cleaning and replacing oil, inspecting wiper seals, and re-lubricating the foam rings with Float Fluid.
At 100 hours or annually, a full damper and air spring service is advised. This includes changing damper oil, inspecting the GRIP2 internals for wear, replacing crush washers, and re-greasing the air spring assembly. Always use Fox-approved suspension fluids and observe correct fill volumes.
Troubleshooting Setup Issues
Many riders encounter common issues with improper setup. Excessive brake dive often results from too little LSC or low air pressure. Harshness on small bumps typically indicates insufficient negative air spring volume or overdamped rebound settings.
If the fork tops out with a clunk, reduce HSR slightly or inspect the air spring for over-inflation. Inconsistent travel or squelching noises may point to oil starvation in the lowers or worn foam rings. In all cases, resetting air pressure and baseline damper settings is a smart first step.
Optimizing Performance Through Customization
Advanced riders often customize the 38 Factory GRIP2 by modifying volume spacers. Reducing volume increases progressivity, ideal for aggressive descents. Conversely, removing spacers makes the fork more linear—better for lighter riders or smoother trails.
You can also match the damper tuning to your terrain. For rocky and rooty conditions, increase LSC slightly to reduce deflection. On jump-heavy trails, increase HSC to prevent bottom-out. Riders can even swap in custom valving or a coil conversion for a tailored feel, though this requires professional service.
Compatibility With Drivetrain and Chassis Components
The 38 Factory GRIP2 is designed around modern 29” and 27.5” enduro bikes with 44mm or 51mm offset options. It fits Boost front hubs (110x15mm) and pairs best with 180–203mm rotors. Fork travel can range from 160–180mm depending on the configuration.
This fork is not backward compatible with non-Boost spacing or quick-release axles. For drivetrain interfaces, clearance with large chainrings and dual-crown-style bash guards should be checked to avoid interference. The fork steerer is standard tapered (1.5” to 1 1/8”), fitting most modern frames.
Comparison With Similar Fork Models
Compared to the Fox 36 GRIP2, the 38 provides a noticeably stiffer chassis, ideal for heavier riders or those demanding precise steering in rough terrain. Versus the RockShox ZEB Ultimate, the Fox 38 offers finer damper adjustment, though some riders prefer the more supple feel of the ZEB’s Charger 3 damper.
Weight-wise, the 38 is slightly heavier than the 36, but with improved support. Price-wise, it’s a premium offering, typically above $1,100 USD, reflecting its top-tier construction and performance. Riders focused on gravity riding or bike park laps will benefit most from the upgrade.
Conclusion
Servicing and optimizing the Fox 38 Factory GRIP2 is essential for maintaining its high-performance edge. With precise adjustments, scheduled maintenance, and attention to compatibility, riders can ensure peak performance on every ride. This fork’s advanced features reward meticulous setup and care, making it a centerpiece for aggressive enduro and trail builds.