The Fox 36 Performance Elite is a high-end suspension fork renowned for its superior small bump sensitivity, adjustability, and stiffness. Regular oil changes are essential to maintain its performance and longevity. This article provides a detailed guide for performing a complete lower leg service, including an oil change, on the Fox 36 Performance Elite. Whether you’re a seasoned rider or a beginner home mechanic, this step-by-step guide will help you keep your fork in top condition.
Tools Required
- 10mm and 15mm sockets
- 2mm and 5mm hex wrenches
- Torque wrench [paid link] (in Nm)
- Flat pick or dental tool
- Clean oil pan
- 20wt Gold suspension oil (Fox-approved)
- High-quality suspension grease (e.g., Slick Honey or Fox Float Fluid)
- Isopropyl alcohol (90%+)
- Lint-free cloths
- Rubber or nitrile gloves
- Shock pump
Understanding the Fork Structure
The Fox 36 Performance Elite features a GRIP2 damper and an EVOL air spring. Unlike entry-level forks, this model is built to handle aggressive trail and enduro riding. It requires regular service intervals, specifically a lower leg oil change every 30-50 hours of riding. The oil lubricates the fork’s internal components, reduces friction, and protects seals from contamination.
Preparation and Safety Measures
Before beginning, ensure the bike is secure in a stand. Remove the front wheel and brake caliper to access the fork lowers. Always deflate the air spring completely before attempting disassembly. Wear gloves to protect your hands from oil and solvents. Use isopropyl alcohol to clean the stanchions and crown before starting.
Removing the Lower Legs
Start by removing the rebound adjuster knob with a 2mm hex wrench. Then, using the 10mm and 15mm sockets, loosen the foot nuts at the bottom of each fork leg. Lightly tap each bolt with a mallet to unseat the lower legs. Once both sides are loose, gently slide the lowers off the stanchions. Be prepared for oil drainage—have your oil pan ready.
Draining and Cleaning
With the lowers removed, allow the remaining oil to drain into the pan. Inspect the inside of the lowers for debris, worn bushings, or contaminated oil. Use a clean, lint-free cloth and isopropyl alcohol to thoroughly clean both the inside of the lowers and the exposed stanchions. Remove the foam rings and clean or replace them as needed.
Inspecting Seals and Foam Rings
Examine the dust wipers and foam rings for wear or damage. If they appear dry, cracked, or loose, replace them with Fox-specific replacements. Even if seals seem intact, replacing them during an oil change is recommended every 100 riding hours for optimal performance.
Re-lubricating and Reassembling
Saturate the foam rings with fresh 20wt Gold oil before reinstalling them. Apply suspension grease to the inside of the dust seals and carefully reinstall the lowers onto the stanchions. Be cautious not to damage the seals during reinstallation. Slide the lowers up until they contact the castings.
Adding the Correct Oil Volume
Inject the manufacturer-recommended volume of 20wt Gold oil into each lower leg: typically 40cc in the air side and 10cc in the damper side for the 36 Performance Elite. Check your exact fork model’s service manual for specific volumes. Avoid overfilling, which can create excess pressure and leakage.
Reinstalling Foot Nuts and Torque Specifications
Reinstall the foot nuts using your torque wrench [paid link]. The recommended torque is 5.1 Nm for both the air and damper side nuts. Do not overtighten, as this can damage the damper shaft or air rod. Reinstall the rebound knob and ensure it clicks into place properly.
Air Spring Recharging
Using a shock pump, reinflate the air spring to your desired pressure. Fox recommends starting with the pressure suited to your rider weight and tuning from there. Cycle the fork a few times to distribute the oil evenly, and verify smooth travel through the stroke.
Post-Service Inspection
Inspect the fork thoroughly for oil leaks around the seals or foot nuts. Reinstall the brake caliper and front wheel, and test brake alignment. Compress the fork to check for smooth operation and absence of noises. Take the bike for a short test ride, gradually putting it through its full travel range.
Troubleshooting Common Issues
If the fork feels sticky or slow to return, check that the oil volume and air pressure are correct. Persistent leaking around the seals indicates a damaged or improperly seated seal. Spongy or inconsistent damping could mean trapped air in the damper or incorrect reassembly.
Customization and Performance Tuning
Post-service, riders can fine-tune performance by adjusting the GRIP2 damper’s high- and low-speed compression and rebound settings. Riders seeking more small bump compliance might slightly under-inflate the air spring and increase rebound damping. For aggressive descents, increase low-speed compression to improve mid-stroke support.
Compatibility Considerations
The Fox 36 Performance Elite is compatible with Boost (15x110mm) spacing and supports both 29” and 27.5” wheel sizes, depending on the chassis. It pairs best with Fox’s Factory or Performance rear shocks for balanced ride dynamics. Ensure your fork is matched with the correct headset and axle standard for optimal performance.
Comparisons with Similar Models
Compared to the Fox 36 Factory, the Performance Elite uses the same chassis and GRIP2 damper but omits the Kashima coating, making it slightly less smooth in initial stroke feel. Against the Fox 36 Rhythm, the Performance Elite stands out with a stiffer chassis, higher-end internals, and more external adjustability, making it ideal for aggressive trail and enduro riders.
Service Intervals and Maintenance Tips
Change the lower leg oil every 30 to 50 hours of riding, depending on terrain and conditions. A full damper service is recommended every 100 hours or annually. Keep stanchions clean after each ride to reduce contamination. Regular air pressure checks and damper setting reviews enhance ride consistency.
FAQs
How often should I change the oil in my Fox 36 Performance Elite fork?
Every 30 to 50 hours of riding, or sooner if exposed to muddy or dusty conditions.
What oil should I use for a Fox 36 Performance Elite oil change?
Fox recommends 20wt Gold suspension oil for the lower legs.
Do I need to replace the seals every time I change the oil?
Not every time, but it’s advised to replace them every 100 hours or annually for peak performance.
Can I use other oils instead of 20wt Gold?
Using non-recommended oils may affect damping and lubrication. Always use Fox-approved oil for best results.
Is the Performance Elite fork compatible with a coil spring conversion?
While it is primarily air-sprung, aftermarket coil conversion kits exist. Consult a professional for installation.
What are signs that my fork oil needs changing?
Reduced small bump sensitivity, noise during compression, or visible oil weeping are key indicators.
Conclusion
Changing the oil in your Fox 36 Performance Elite fork is a crucial maintenance task that boosts longevity and ensures consistent ride quality. With the right tools, attention to detail, and regular intervals, home mechanics can maintain factory-level performance without costly shop visits.