The Fox 36 Factory GRIP2 suspension fork is a high-performance component tailored for aggressive trail and enduro riding. Equipped with the GRIP2 damper, it allows riders to finely tune their suspension characteristics for optimal control and comfort. This guide provides a comprehensive overview of installation, tuning, maintenance, and compatibility considerations, specifically for the 36 Factory GRIP2 model.
Tools Required
- Torque wrench [paid link] with 5mm and 6mm hex bits
- Shock pump with a pressure gauge
- Suspension oil and grease (Fox recommended)
- Clean rags and isopropyl alcohol
- Valve core remover
- Allen key set
- Work stand (optional but recommended)
- Caliper (for measuring travel and sag)
Installation of the Fox 36 Factory GRIP2 Fork
The 36 Factory GRIP2 fork requires a precise and secure installation to ensure performance and safety. Begin by cutting the steerer tube to the correct length based on your bike frame and headset configuration. Be sure to account for headset stack height and desired stem positioning.
Next, press in the star nut or install a threaded insert if you are using a one-piece stem system. Grease the steerer tube lightly before inserting it into the headset. Torque the stem bolts to the manufacturer’s specifications, ensuring even clamping force.
Finally, ensure the front wheel axle is properly aligned. The Fox 36 uses a 15mm thru-axle; tighten it using a 6mm Allen wrench [paid link] and verify that the axle is flush and secure.
Understanding the GRIP2 Damper System
The GRIP2 damper is Fox’s most advanced cartridge system, offering independent high- and low-speed compression and rebound adjustments. It utilizes Variable Valve Control (VVC) to provide more refined damping without altering the shim stack.
The adjusters are located on the top of the right leg (compression) and the bottom of the right leg (rebound). Each adjuster is clearly labeled with directional arrows for increasing or decreasing damping forces. Riders should familiarize themselves with these settings, as each has a substantial effect on ride feel.
Air Spring Setup and Initial Tuning
The left leg of the 36 GRIP2 houses the air spring. Start by determining your desired sag percentage, typically between 15-20% for trail use and up to 25% for enduro. To calculate sag, measure the exposed stanchion length at full extension, then sit on the bike in riding gear and measure again.
Use a shock pump to pressurize the air spring according to Fox’s air pressure chart based on rider weight. After achieving the target sag, set the rebound using the red dial. A good baseline is one click slower than halfway open. Fine-tune by adjusting based on trail feedback.
Compression and Rebound Adjustments
The GRIP2 damper features four dials:
- High-Speed Compression (HSC): Resists bottoming during heavy impacts.
- Low-Speed Compression (LSC): Controls brake dive and mid-stroke support.
- High-Speed Rebound (HSR): Controls return speed from big hits.
- Low-Speed Rebound (LSR): Affects general ride feel and traction.
Start with factory baseline settings (usually 8 clicks out from fully closed for each dial) and adjust in small increments. Ride similar terrain when testing changes to isolate the effects of each setting.
Maintenance Schedule and Procedures
Routine maintenance ensures longevity and peak performance. Fox recommends 125-hour lower leg service intervals or sooner under harsh conditions.
Start by removing the front wheel and releasing all air from the spring. Drain the oil from the lowers after removing the foot nuts. Clean the internals with isopropyl alcohol and replace the foam rings and wiper seals if worn.
Reassemble using Fox 20wt Gold oil, ensuring proper lubrication. Repressurize the air spring and verify all settings before riding.
Troubleshooting Common Set-Up Issues
Harshness on small bumps: Reduce LSC or LSR for better sensitivity. Also, verify correct sag.
Bottoming out: Increase HSC or add volume spacers to reduce air spring progression.
Fork feels sluggish or doesn’t extend fully: Check for air pressure loss or excessive rebound damping. Re-lubricate the air spring assembly.
Clicking or knocking sounds: Usually caused by loose axle or headset. Re-torque bolts and check stanchion alignment.
Volume Spacer Customization
Volume spacers allow you to alter the air spring curve by changing the volume of the air chamber. Adding spacers increases progression, useful for aggressive riders who experience frequent bottom-outs.
Remove the top cap of the air spring with a 6-point socket. Install or remove the plastic volume spacers as needed—Fox provides a maximum number based on travel length. Reassemble, pressurize, and test for noticeable differences.
Optimizing Fork Performance for Terrain
For rocky, high-speed descents, increase HSC and reduce LSR for better control. On smoother trails, reducing both compression circuits can improve suppleness and comfort.
Cold weather riding requires slight adjustments to rebound settings due to oil viscosity changes. Always test on familiar trails after changes.
Comparing GRIP2 vs FIT4 vs GRIP
The GRIP2 damper outperforms FIT4 and GRIP in adjustability and fine-tuning. FIT4 offers quicker on-the-fly adjustments, making it more suitable for cross-country riders. GRIP is more basic but reliable, best suited for budget-conscious or casual trail riders.
The 36 Factory GRIP2 is the superior choice for riders who want maximum customization and performance on varied terrain.
Compatibility with Other Drivetrain and Suspension Components
The 36 Factory GRIP2 is compatible with both 29” and 27.5” wheel sizes, depending on the model. It supports Boost spacing (110mm hub) and is designed for tapered steerers.
Ensure your frame has clearance for the axle-to-crown height, especially when upgrading from a shorter fork. The GRIP2 damper integrates well with advanced rear shocks like Fox Float X2, allowing a balanced suspension system.
FAQs
1. What’s the recommended sag for the Fox 36 GRIP2?
Typically, aim for 15–20% for trail riding and 20–25% for enduro use, based on your stanchion length.
2. Can I use the Fox 36 GRIP2 for bikepacking or XC racing?
While possible, the fork is optimized for aggressive trail and enduro. Its weight and damping features are overkill for XC and long-distance riding.
3. How do I know when it’s time to service the fork?
If you notice decreased performance, oil leaking, or creaking sounds, service is due. Otherwise, follow the 125-hour or yearly maintenance interval.
4. Can I upgrade my GRIP or FIT4 fork to GRIP2?
Yes, Fox offers damper upgrade kits, but ensure compatibility with your chassis and check for cost-effectiveness.
5. What’s the benefit of using volume spacers?
Volume spacers allow you to control the fork’s end-stroke progression, helping prevent bottom-outs and fine-tune ramp-up feel.
6. Is there a mobile app for setting up the Fox 36 GRIP2?
Fox’s website and RideFox app provide pressure charts and tuning guidance, though hands-on tuning is still essential.