The Fox 38 Performance Elite is a high-performance suspension fork designed for aggressive trail and enduro riders. With its robust 38mm stanchions, sophisticated GRIP2 damper, and ample adjustability, the fork provides impressive control on technical descents and variable terrain. However, to maintain its peak performance, routine servicing and precise setup are essential. This guide provides a comprehensive breakdown of installing, maintaining, and optimizing the Fox 38 Performance Elite suspension fork.
Tools Required
- Torque wrench [paid link] with Nm scale
- Shock pump
- Allen wrenches [paid link] (4mm, 5mm, 6mm)
- 26mm or 28mm socket (for top caps)
- Suspension fork oil (Fox-recommended 20wt Gold, 5wt Teflon-infused)
- Clean rags
- Plastic pick or seal puller
- Fox lower leg removal tool or soft mallet
- Syringe for oil measurement
- Isopropyl alcohol (for cleaning)
- Nitrile gloves
Installation Overview
Correct installation is crucial for optimal fork function and rider safety. Begin by verifying that your head tube and stem are compatible with the 1.5″ tapered steerer tube. Ensure the steerer is cut to the appropriate length, allowing space for spacers and your stem stack height.
Apply a thin coat of grease to the steerer before inserting it into the headset. Once aligned, torque the stem bolts and top cap to the manufacturer’s specification, usually between 4–6 Nm. Install the front wheel and brake caliper, ensuring the axle is correctly torqued (15mm QR or Kabolt depending on the model) and the rotor is centered in the caliper.
Align the caliper and bed the brakes thoroughly before riding. Confirm the sag using a shock pump and rider weight.
Suspension Setup and Adjustment
The Fox 38 Performance Elite uses the GRIP2 damper, featuring high-speed and low-speed compression and rebound adjustments. Begin setup with Fox’s baseline settings found on the fork’s air spring chart. Adjust air pressure to achieve 15–20% sag for aggressive trail use or 20–30% for enduro and downhill settings.
Rebound and compression adjusters are clearly marked. Always make incremental changes and test ride after each adjustment. Use the high-speed compression and rebound to fine-tune support during jumps or high-speed hits, while low-speed adjustments manage rider inputs like braking and cornering.
Ensure the air bleeders are used after rides with large elevation or temperature changes to equalize internal pressure.
Routine Maintenance Intervals
To extend the lifespan of the 38 Performance Elite, follow Fox’s maintenance schedule:
- Every 30 hours: Clean stanchions and inspect dust wipers; apply Float Fluid to foam rings.
- Every 50 hours: Perform a lower leg service to replace oil and inspect seals.
- Every 125 hours or annually: Complete a full damper and air spring service, including bushing inspection and full fluid replacement.
Avoid extended intervals without service, especially in wet or dusty environments. Use only Fox-approved fluids and replacement parts to maintain warranty and performance standards.
Lower Leg Service Procedure
Lower leg service is vital for smooth suspension movement and longevity. Begin by removing the front wheel and brake caliper. Use a 5mm Allen wrench [paid link] to loosen and remove the bottom bolts. Carefully tap the bolts to dislodge the lower legs using a soft mallet or the Fox removal tool.
Once separated, drain the oil and clean all internals with isopropyl alcohol. Replace foam rings, dust wipers, and re-lubricate with Float Fluid. Reinstall the lower legs, ensuring the oil volume matches Fox’s specifications. Torque bolts to 5.1 Nm.
Check alignment and operate the fork through its travel before reattaching the brake and wheel.
Troubleshooting Setup Issues
Several common issues can affect fork performance:
- Harsh ride: Often caused by excessive compression damping or low air pressure. Check sag and reduce high-speed compression in small increments.
- Fork not returning fully: Can be due to overfilled lower legs or negative air spring issues. Ensure oil volumes are correct and equalize air chambers.
- Noisy travel or “slurp” sounds: Typically air ingestion due to worn seals. Perform a lower leg service and inspect for damage.
Addressing problems early prevents wear on internal components and ensures consistent ride quality.
Optimizing for Performance
For riders seeking enhanced performance, consider these optimization steps:
- Volume spacers: Adjust progressiveness by adding or removing volume spacers. More spacers increase ramp-up, suitable for hard hitters or jump-focused terrain.
- Custom rebound tuning: Match rebound settings to your bike’s rear shock characteristics for balanced handling.
- Coating upgrades: While the Performance Elite lacks the Kashima coating, upgrading stanchions to Kashima (or using stiction-reducing additives) can enhance small bump compliance.
Regularly re-evaluate settings after significant terrain changes or equipment updates.
Compatibility Considerations
The 38 Performance Elite is designed for modern enduro and trail bikes. Confirm these compatibility points before purchase or installation:
- Steerer tube: Tapered 1.5” to 1.125” compatible with most frames.
- Axle size: 15x110mm Boost spacing standard.
- Rotor size: Compatible with 180mm rotors out-of-the-box; adapters required for 200mm+.
- Tire clearance: Up to 2.6” width depending on rim and casing profile.
- Crown race: Standard 40mm integrated headset race compatible.
Always cross-check manufacturer documentation or consult a professional mechanic for confirmation.
Model Comparison
Comparing the 38 Performance Elite to similar models helps clarify its value:
- Fox 38 Factory: Features the same chassis and GRIP2 damper but adds Kashima-coated stanchions for better friction reduction.
- RockShox ZEB Ultimate: Comparable stiffness and travel range, with a more tunable Charger 3 damper. Slightly lighter but may lack Fox’s small bump compliance.
- Marzocchi Z1: A budget-friendly alternative using a simplified GRIP damper. Less tunable but retains stiffness.
The Performance Elite strikes a balance between adjustability and cost, ideal for riders who want high-end features without the premium price tag of the Factory line.
FAQs
1. How often should I service my Fox 38 Performance Elite?
Basic lower leg service should occur every 50 riding hours, with full service recommended annually or every 125 hours.
2. What air pressure should I run in my Fox 38?
Refer to the air pressure chart on the fork leg. Adjust based on rider weight and desired sag—typically 15–20% for aggressive trail use.
3. Can I upgrade my Performance Elite to Factory level?
Yes, you can upgrade stanchions to Kashima-coated tubes, though it may void the warranty. Check with Fox service centers for compatibility.
4. Why is my fork making a squishing sound?
This could be due to oil aeration or air ingress. Performing a lower leg service and checking for seal wear is recommended.
5. How do I install volume spacers in the Fox 38?
Remove the air cap, release all air pressure, and unscrew the air top cap using a 28mm socket. Add or remove volume spacers as needed and reassemble.
6. Is the Fox 38 compatible with older 29” trail bikes?
Only if the bike frame and headset support a 1.5” tapered steerer and Boost axle spacing. Always verify axle-to-crown measurements to ensure geometry remains balanced.