The Fox 36 Factory GRIP2 is a high-performance suspension fork designed for aggressive trail and enduro riding. Regular maintenance, particularly oil changes, is crucial to preserve its performance, extend its lifespan, and maintain consistent damping. This guide outlines the tools required, step-by-step oil change procedure, and additional tips for troubleshooting and optimizing your GRIP2 fork.
Tools Required
- 10 mm socket wrench
- 2.5 mm and 5 mm hex wrenches
- Torque wrench [paid link]
- Oil drain pan
- Suspension-specific fork oil (Fox 20wt Gold and 5wt Telfon infused or as specified)
- Fox Float Fluid or Slickoleum grease
- Isopropyl alcohol and clean lint-free cloths
- Plastic syringe or oil measuring beaker
- Soft-jawed vise (optional but recommended)
Understanding the 36 Factory GRIP2 Architecture
The GRIP2 damper uses a sealed cartridge design and features both high- and low-speed compression and rebound adjusters. This design requires careful handling to avoid contamination during maintenance. The fork’s lower legs are lubricated by bath oil, which should be replaced every 30 to 50 hours of riding depending on terrain and weather conditions.
Step-by-Step Oil Change Procedure
Preparation and Cleaning
Before starting, thoroughly clean the fork stanchions, lowers, and surrounding area to prevent dirt from entering internal components. Place the bike or fork in a stable repair stand. If removing the fork from the bike, secure it in a soft-jawed vise by the steerer tube.
Removing the Lower Legs
- Use a 2.5 mm hex wrench to loosen and remove the rebound knob from the right-side bottom of the fork.
- Use a 10 mm socket wrench to remove the bottom nuts on both fork legs.
- Lightly tap the exposed shaft ends with a soft mallet to disengage the shafts from the lowers.
- Slowly slide the lowers off the uppers, allowing excess oil to drain into the pan.
Cleaning and Inspection
Inspect the inside of the lower legs for wear, dirt, and oil condition. Clean them with isopropyl alcohol and a lint-free cloth. Also check the foam rings and replace if worn or contaminated.
Adding Fresh Oil and Lubrication
- Soak new or cleaned foam rings in 20wt Gold oil.
- Apply Fox Float Fluid or Slickoleum grease to the wiper seals and dust wipers.
- Slide the lower legs partially onto the stanchions.
- Using a syringe or measuring beaker, add 10 mL of 20wt Gold oil into each leg (refer to the most recent Fox service chart for your specific fork year).
- Gently push the lowers fully into place.
Reassembling the Fork
- Reinstall and torque the bottom nuts to Fox’s specified values (around 5.1 Nm).
- Reattach the rebound knob using the 2.5 mm hex wrench.
- Wipe down the fork and perform a functional check by compressing it several times.
Troubleshooting Common Issues
If the fork feels inconsistent or noisy after service, possible causes include air bubbles in the damper, contaminated oil, or incorrect oil volume. To resolve:
- Recheck the oil volume and use only the recommended suspension fluids.
- Ensure foam rings and seals are correctly seated.
- If issues persist, consider a full damper bleed or inspection by a certified Fox technician.
Customization and Optimization
While an oil change is primarily for maintenance, it offers an opportunity to fine-tune fork performance:
- Choose slightly heavier or lighter oil for subtle changes in damping feel, only if you’re experienced.
- Ensure correct air pressure and volume spacers are in use for your weight and riding style.
- After maintenance, recheck high-speed and low-speed compression/rebound settings to your previous preferences or re-tune as needed.
Compatibility with Other Components
The 36 Factory GRIP2 is compatible with a range of axle standards and disc brake mounts. However, oil maintenance should be fork-specific:
- Use only Fox-recommended oils; mixing brands can degrade seals.
- Be aware of any changes in lower leg design across different 36 models to ensure compatibility with specific oil volumes and tools.
Comparison with Similar Forks
Compared to the 36 Performance or Rhythm series, the Factory GRIP2 fork requires more precision during service due to its advanced damping system. However, its tunability and performance benefits justify the additional care:
- GRIP2 offers externally adjustable HSC/LSC and HSR/LSR, unlike simpler GRIP dampers.
- Factory-level Kashima stanchions require proper lubrication to preserve coating integrity.
Final Notes on Service Intervals
To maintain peak performance:
- Perform a lower leg oil service every 30–50 riding hours.
- Schedule full damper and air spring service every 100–200 hours.
- Keep records of service dates and any tuning changes for reference.
Frequently Asked Questions
How often should I change the oil in my Fox 36 Factory GRIP2 fork?
Every 30–50 hours of riding or sooner in muddy or wet conditions.
What type of oil does the 36 GRIP2 use?
Use Fox 20wt Gold for the lower legs and 5wt Teflon oil for the damper (when applicable).
Can I do an oil change without removing the fork from the bike?
Yes, but securing it in a repair stand and keeping it level is crucial.
What if my fork makes noise after the oil change?
Recheck the oil volume, seal seating, and ensure no air is trapped. If unresolved, a full damper bleed may be necessary.
Is it okay to use different brands of oil?
No. Using non-recommended oils can damage seals and reduce performance.
Should I grease the wiper seals during the oil change?
Yes. Applying suspension-specific grease prolongs seal life and enhances smoothness.