The Fox 34 Float Factory GRIP2 suspension fork is engineered for trail and all-mountain riding, offering highly tunable performance through its GRIP2 damper with Variable Valve Control (VVC). Maintaining this component is critical to ensuring smooth travel, consistent damping, and long-term durability. This guide provides detailed instructions on installation, setup, regular maintenance, and service procedures specifically for the 34 Float Factory GRIP2.
Tools Required:
- 10mm and 26mm sockets
- Torque wrench [paid link] (0–15 Nm range)
- Suspension fluid (Fox 20wt Gold, Fox Float Fluid)
- Clean rags and isopropyl alcohol
- Fox lower leg removal tool
- Pick or seal puller
- Allen keys [paid link] (4mm, 5mm, 6mm)
- Suspension pump
Initial Setup and Installation
Preparing the Fork for Installation
Before installation, inspect the steerer tube to ensure it’s properly cut and the star nut is installed if using a non-carbon steerer. Confirm that the fork’s axle-to-crown measurement matches your bike geometry requirements.
Installing the Fork on the Bike
Align the steerer tube into the headset. Use the appropriate spacers and top cap to preload the headset bearings without play. Tighten the stem bolts to the manufacturer-recommended torque settings. Ensure the brake caliper mounts align with the fork’s post mount system, and install the front brake caliper securely.
Air Spring Setup
Setting Sag and Air Pressure
Use Fox’s recommended pressure chart based on rider weight, or start with 80–90 psi for a 160 lb rider as a baseline. Apply sag o-rings and have the rider sit in a neutral riding position to achieve 20–30% sag. Adjust pressure accordingly with a shock pump.
Adjusting Volume Spacers
The 34 Float Factory GRIP2 allows volume spacer customization to tune bottom-out resistance. Remove the air cap and deflate the spring completely before accessing the top cap with a 26mm socket. Add or remove volume spacers per ride preference, being careful not to exceed the maximum limit (typically five spacers).
GRIP2 Damper Adjustment
High and Low-Speed Compression
Turn the high-speed compression knob (blue) fully clockwise to close, then back off to desired settings. Low-speed compression (smaller blue knob) adjusts chassis support. For trail riding, a midpoint on both is a good starting point.
High and Low-Speed Rebound
The red knob adjusts high-speed rebound; begin with it in the middle of its range. The smaller inner knob is for low-speed rebound and should be tuned last. Use slower rebound settings for more control on rough terrain and faster settings for responsiveness.
Routine Maintenance Intervals
Fox recommends lower leg maintenance every 30–50 hours of riding. This includes cleaning, oil replacement, and foam ring lubrication.
Lower Leg Service Procedure
Removing the Lowers
Clean the fork thoroughly. Remove the air pressure from the air spring. Use a 10mm socket to loosen the air side foot nut and a 15mm wrench or socket for the damper side. Tap the bolts gently to release the legs, then slide the lowers off slowly, collecting any residual oil.
Replacing Seals and Foam Rings
Use a seal puller or pick to remove old wiper seals and foam rings. Clean the inside of the lowers with isopropyl alcohol. Soak new foam rings in 20wt Gold oil and install them. Press new dust wipers evenly using a seal driver tool.
Reinstalling the Lowers and Refilling Oil
Insert 10cc of Fox Float Fluid on the air side and 15cc of 20wt Gold on the damper side. Slide the lowers back onto the stanchions, being careful not to dislodge seals. Torque the foot nuts to 5.1 Nm.
Troubleshooting Common Issues
Inconsistent Rebound or Compression Feel
This typically results from air or oil contamination inside the damper. A full damper bleed or rebuild may be required. Check for proper damper function by cycling the fork and listening for suction or squish noises.
Harsh or Sticky Travel
Sticky travel may result from dry foam rings or dirty stanchions. Perform a lower leg service to resolve friction and ensure adequate lubrication.
Oil Leaks
Worn dust wipers or overfilled oil volumes can lead to visible leaks. Replace wipers during routine service and always measure fluids accurately.
Performance Customization
Fine-Tuning the VVC System
The GRIP2’s VVC allows for ultra-precise high-speed adjustments. Riders looking for more mid-stroke support can increase high-speed compression and reduce rebound damping to maintain responsiveness.
Rider-Specific Tuning Suggestions
For aggressive downhill riding, increase both high and low-speed compression for better chassis control. For technical climbs, reduce compression for better sensitivity and increase low-speed rebound to avoid bobbing.
Compatibility Considerations
The Fox 34 Float Factory GRIP2 is optimized for 29” wheels with 44mm offset and Boost (110mm) spacing. It supports rotors up to 203mm using adapters. It pairs best with lightweight trail frames and 1x drivetrains to reduce cockpit clutter.
Ensure your front axle standard (15x110mm Boost) and brake mount spacing match before purchase or installation.
Comparison With Similar Forks
Fox 34 Performance Elite vs Factory GRIP2
While both share chassis geometry, the Factory GRIP2 includes a more advanced damper and Kashima coating. The Performance Elite uses the FIT4 damper, offering simpler adjustments but slightly less tunability.
Fox 36 vs Fox 34 GRIP2
The Fox 36 offers greater stiffness and longer travel (up to 170mm) but at a weight penalty. Riders focused on aggressive enduro may prefer the 36, while the 34 is better suited for trail and technical XC terrain.
Frequently Asked Questions
1. How often should I service my Fox 34 GRIP2 fork?
Routine lower leg service is recommended every 30–50 hours. Full damper and air spring service should be done annually or every 100–125 hours.
2. Can I use the 34 Float Factory GRIP2 on an e-MTB?
While possible, it’s optimized for non-motorized trail bikes due to chassis strength and weight considerations. Consider the Fox 36 or 38 for e-MTB use.
3. What is the maximum rotor size for the 34 GRIP2?
It officially supports up to 180mm rotors directly and 203mm with a post mount adapter.
4. Why is my rebound adjustment not making a difference?
Air in the damper or incorrect oil levels may be preventing proper damping. A damper bleed or service is required.
5. Can I change the travel on my Fox 34 GRIP2 fork?
Yes, travel is adjustable via air shaft swap, available in 10mm increments (e.g., 130mm to 140mm). It requires partial disassembly.
6. Is the Kashima coating just cosmetic?
No. The Kashima coating reduces friction and improves small bump sensitivity and durability compared to anodized stanchions.
Conclusion
Servicing your Fox 34 Float Factory GRIP2 fork at home is entirely feasible with the right tools and knowledge. By adhering to regular maintenance intervals and fine-tuning adjustments to your ride style, you can preserve fork performance and longevity. Always follow Fox’s torque specifications and fluid volumes, and don’t hesitate to consult professional support for advanced damper servicing.