The Fox 38 Performance Elite [paid link] suspension fork is designed for aggressive trail and enduro riding, offering a high level of stiffness, control, and tuning flexibility. Though it shares many features with the Factory model, the Performance Elite version omits the Kashima coating and focuses instead on delivering top-tier damping and adjustability. For riders new to suspension tuning, understanding how to set up and maintain this fork is crucial for getting the best performance out of your bike.
This guide provides a step-by-step approach to installing, adjusting, maintaining, and optimizing the Fox 38 Performance Elite [paid link] fork.
Tools Required
- Torque wrench [paid link] with hex bit set
- Shock pump (high-pressure)
- Suspension grease (compatible with Fox components)
- Isopropyl alcohol and clean cloths
- Fox 5wt Teflon-infused suspension fluid
- Allen keys [paid link] (4mm, 5mm, 6mm)
- Zip ties
- Crown race setting tool (if installing a new crown race)
- Cassette pliers or soft-jawed vise (for fork service)
- Air pressure gauge
- Digital caliper [paid link] (optional, for precise sag setup)
Initial Installation Process
Before tuning the Fox 38 Performance Elite fork, ensure it is installed correctly on the bike. This step is critical for safety and performance.
Start by preparing the steerer tube to match your bike’s head tube length and stem configuration. Carefully cut the steerer with a pipe cutter or saw guide for accuracy. Install the star nut or threaded insert as per your headset’s specifications. When pressing in the crown race, ensure it sits flush to avoid misalignment during rides.
Next, slide the fork into the head tube, align the headset bearings, and install the top cap and spacers. Tighten the stem bolts evenly using a torque wrench [paid link]. Check the headset preload by holding the front brake and rocking the bike back and forth—there should be no play.
Lastly, route the brake hose along the fork leg, securing it with the integrated cable guides. Use zip ties sparingly and ensure no kinks or sharp bends in the hose.
Air Spring Setup and Sag Adjustment
Setting the correct air pressure is essential for proper fork function. The Fox 38 Performance Elite uses a self-equalizing air spring system that must be tuned according to rider weight and intended terrain.
Begin by inflating the fork using a shock pump to the recommended PSI based on Fox’s chart, usually found on the back of the left fork leg. A good baseline is 1 PSI per pound of rider weight, including gear. For example, a 170 lb rider would start around 70–75 PSI.
Set sag by wearing your riding gear and assuming your standard riding position. Push down on the fork to cycle it, then let it settle. The sag should be around 15–20% of total travel (around 25–30mm for a 160mm fork). Use a zip tie as a travel indicator if needed.
Adjust the PSI incrementally to hit your target sag range. After finalizing air pressure, equalize the positive and negative chambers by pressing the fork down firmly a few times.
Rebound and Compression Tuning
The Fox 38 Performance Elite offers both low-speed compression (LSC) and rebound damping adjustments. Some models also include a GRIP2 damper with high-speed compression and rebound controls.
For rebound, turn the red dial at the bottom of the right fork leg. Start from fully closed (clockwise) and turn it back counterclockwise 7–9 clicks for a balanced feel. Heavier riders or those on rougher trails might prefer slower rebound to avoid pogoing.
Low-speed compression is adjusted via the black knob on top of the right leg. Start in the middle position and make one-click changes to suit your trail speed and terrain. More compression stiffens the fork, ideal for climbing and smoother trails. Less compression allows more small-bump compliance.
If equipped with high-speed adjustments, use these only after you’ve dialed in low-speed settings. These primarily affect fork performance during fast, aggressive hits like drops or rock gardens.
Troubleshooting Common Issues
Fork not holding air: Inspect the Schrader valve for leaks, and check for oil contamination around the air cap. If persistent, service the air spring seals.
Excessive stiction: Clean the stanchions and inspect for dirt build-up. Apply a light coating of suspension lubricant and cycle the fork. Consider a lower leg service if stiction continues.
Noisy operation: Clicking or knocking sounds often indicate loose headset components, but can also be due to bushing play in the fork. Verify torque settings and check for lateral play at the lowers.
Inconsistent damping: Oil degradation or air migration within the damper can cause erratic fork performance. If noticeable, a full damper service may be required.
Regular Maintenance Schedule
To keep your Fox 38 Performance Elite performing optimally, follow a strict maintenance schedule. Regular cleaning, lubrication, and oil changes ensure long service life.
Every 25–30 hours of ride time:
- Wipe stanchions and inspect seals
- Apply a small amount of suspension-specific lube
- Check air pressure and adjust sag if needed
Every 50 hours:
- Perform a lower leg service
- Replace dust wipers if signs of wear are visible
- Change bath oil (Fox 5wt Teflon fluid)
Every 100–125 hours or annually:
- Full damper and air spring rebuild
- Replace seals and foam rings
- Inspect internal bushings for wear
Performance Optimization and Customization
The 38 Performance Elite can be further tailored through volume spacers, which affect progression and bottom-out resistance. Removing spacers makes the fork more linear, while adding them increases ramp-up at the end of the travel.
To install spacers:
- Depressurize the fork completely
- Unscrew the top cap of the air chamber using a cassette tool
- Snap in or remove spacers from the post under the top cap
- Reinstall, torque to spec, and re-pressurize
After any change, reassess sag and rebound to maintain balance. Riders can also experiment with different oil weights or switch to the GRIP2 damper for more advanced tuning if not already equipped.
Compatibility with Other Drivetrain and Suspension Systems
The Fox 38 Performance Elite is designed primarily for long-travel bikes and aggressive riding styles. It pairs best with 150–170mm rear shocks and is compatible with 29-inch wheels.
Its Boost spacing (15x110mm) ensures broad compatibility with modern enduro hubs. The steerer tube is tapered (1.5” to 1-1/8”), fitting most modern mountain bike frames. Brake mount is a 180mm post mount, expandable to 203mm with an adapter.
It integrates seamlessly with Fox’s own rear shocks and remote lockout systems. However, ensure that damping characteristics match the rear suspension for balanced ride feel.
Comparison with Similar Forks
Compared to the Fox 38 Factory, the Performance Elite omits the Kashima coating, which slightly reduces small-bump sensitivity but keeps cost lower. Both share the same chassis, damper options, and air spring.
The RockShox ZEB Ultimate, a direct competitor, offers similar stiffness and damping control but features a different feel due to the Charger 3 damper system. Riders choosing between the two often base decisions on personal brand preference and tuning interface.
For those upgrading from a 36mm chassis fork, the 38 Performance Elite provides noticeable improvements in stiffness and support during hard impacts and aggressive riding.
Conclusion
The Fox 38 Performance Elite is a high-performance suspension fork that offers excellent adjustability, durability, and trail compliance. With proper setup and regular maintenance, it provides confidence-inspiring performance for riders tackling demanding terrain. By following this guide, beginners can unlock the full potential of their fork, avoid common setup pitfalls, and keep their ride dialed throughout the season.