Maximizing Comfort with the 38 Factory GRIP2 Suspension Fork

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The Fox 38 Factory GRIP2 suspension fork is engineered for aggressive enduro and downhill riding, offering exceptional control, tunability, and stiffness. With its cutting-edge GRIP2 damper, the fork allows riders to fine-tune suspension characteristics to meet various trail demands. This guide provides a comprehensive walkthrough on installation, adjustment, maintenance, troubleshooting, customization, and comparison—ensuring your Fox 38 Factory GRIP2 delivers maximum comfort and performance on every ride.

Tools Required

  • 6mm and 5mm Allen wrenches [paid link]
  • Torque wrench [paid link]
  • Crown race setting tool
  • Star nut setter or threadless headset tool
  • Suspension pump
  • Clean rag and suspension grease
  • Isopropyl alcohol
  • Shock oil (Fox 20wt Gold or as specified)
  • Measuring calipers or ruler
  • Fox digital tuning app (optional)

Installation Guidelines

Correct installation of the Fox 38 Factory GRIP2 fork is critical for safety and performance. Begin by ensuring that your bike frame is compatible with a 1.5” tapered steerer and the fork’s axle-to-crown length.

After removing the existing fork, press the crown race onto the Fox 38 steerer tube using a proper setting tool. Install the star nut or compression plug depending on whether your steerer is alloy or carbon. Insert the steerer into the head tube, align the headset spacers, and torque the stem bolts to 5 Nm.

Mount the front wheel using the floating axle system. This feature minimizes binding and ensures precise axle alignment, crucial for fork sensitivity. Tighten the pinch bolts to 10 Nm.

Adjusting the GRIP2 Damper

The GRIP2 damper in the 38 Factory fork features high- and low-speed compression and rebound adjustments. This provides a broader range of tuning for riders who demand personalized performance.

Start with baseline settings recommended by Fox based on rider weight and terrain. The four dials—each with tactile clicks—allow you to fine-tune:

  • High-speed compression (HSC): Controls resistance to harsh impacts and big hits.
  • Low-speed compression (LSC): Adjusts fork firmness under gradual inputs like braking or pedaling.
  • High-speed rebound (HSR): Affects how quickly the fork recovers from large impacts.
  • Low-speed rebound (LSR): Refines small bump sensitivity and ride feel.

Ensure all settings are symmetrical between legs. Use the suspension pump to set air pressure for proper sag, generally 15–20% for aggressive trail use.

Routine Maintenance

To maintain optimal performance and longevity, regular service is crucial. Lower leg service is recommended every 50 hours of ride time, with a full damper overhaul every 125 hours.

For lower leg service:

  1. Remove the fork from the bike.
  2. Clean exterior surfaces thoroughly.
  3. Unbolt the lower legs and slide them off.
  4. Drain old oil and clean the interior with isopropyl alcohol.
  5. Reapply fresh suspension grease to the wiper seals.
  6. Add specified oil volume to the lower legs.
  7. Reinstall and torque all fasteners as per Fox specifications.

Regular cleaning of the stanchions and seals after each ride prevents premature wear.

Troubleshooting Common Issues

Several common issues can arise if the Fox 38 Factory GRIP2 is improperly set up or maintained:

  • Excessive dive under braking: Reduce low-speed compression or increase air pressure.
  • Harsh ride feel: Reduce high-speed compression or check for over-torqued axle bolts.
  • Packing down over multiple hits: Increase high-speed rebound damping or verify sag setting.
  • Oil leaks: Inspect and replace wiper seals and ensure oil volumes are accurate.

Always recheck all adjustments and settings after significant crashes or long descents.

Customization for Optimal Performance

The 38 Factory GRIP2 supports volume spacers in its air spring to alter progression. Adding spacers increases ramp-up, making the fork firmer at the end stroke. This is ideal for riders who bottom out frequently.

To customize progression:

  • Remove the top cap with a 6mm Allen key.
  • Add or remove spacers based on Fox’s tuning chart.
  • Re-torque the top cap to 35 Nm and reset air pressure.

This customization allows tuning without altering damper settings, maintaining small bump sensitivity while preventing harsh bottom-outs.

Comparing the Fox 38 Factory GRIP2 with Similar Models

Compared to the Fox 36 and RockShox ZEB Ultimate, the 38 Factory GRIP2 stands out for its stiffness-to-weight ratio and tunability. While the 36 is better suited for lighter trail bikes, the 38 offers improved chassis support for aggressive descents.

The RockShox ZEB Ultimate, another high-end enduro fork, features the Charger 3 damper, which offers similar adjustability but lacks the independently adjustable high/low-speed rebound of the GRIP2. Riders preferring granular control will favor the Fox 38.

Compatibility Considerations

The Fox 38 Factory GRIP2 uses a 15×110 mm Boost axle and is compatible with both 27.5” and 29” wheels, depending on model. Brake mount compatibility is 180 mm post-mount, with adaptors required for larger rotors.

Ensure the frame has sufficient clearance for the 38’s chassis and that your headset accommodates a 1.5” tapered steerer. The fork integrates seamlessly with Fox’s mud guards and is designed to function optimally with the Fox X2 rear shock for a balanced suspension system.

FAQs

1. How often should I service the Fox 38 Factory GRIP2 fork?
Lower leg service every 50 hours and full damper service every 125 hours is recommended.

2. Can I use the 38 Factory GRIP2 on a trail bike?
While possible, its weight and stiffness are better suited for enduro or downhill frames.

3. What pressure should I run in the air spring?
Refer to Fox’s recommended settings based on rider weight; typically 70–90 psi for most riders.

4. How do I know if I need more volume spacers?
If you frequently bottom out the fork, adding spacers increases progression and prevents harsh ends.

5. What’s the difference between GRIP and GRIP2 dampers?
GRIP2 offers independent high- and low-speed damping adjustments, whereas GRIP is less tunable.

6. Can I install the Fox 38 Factory GRIP2 myself?
Yes, with the right tools and experience. Otherwise, consult a professional mechanic to ensure safety.

Conclusion

The Fox 38 Factory GRIP2 suspension fork is a premium component built for riders who demand performance and adjustability. With precise setup, routine maintenance, and fine-tuning, it can significantly enhance ride comfort and control on the most challenging trails. Whether racing enduro or tackling alpine descents, this fork delivers unmatched consistency and customization, giving riders the confidence to push harder and ride smoother.