The Fox 36 Factory GRIP2 suspension fork is a benchmark in high-performance mountain biking, known for its precision damping control and robust construction. Designed for aggressive trail and enduro riding, the 36 Factory with the GRIP2 damper delivers unparalleled traction and rider comfort. This guide covers detailed installation procedures, tuning techniques, regular maintenance practices, and optimization strategies to get the most out of this advanced suspension fork.
Tools Required:
- Torque wrench [paid link] (2–24 Nm range)
- Hex/Allen keys [paid link] (4mm, 5mm, 6mm)
- Fox suspension pump
- Caliper brake alignment tool
- Crown race setter
- Suspension oil and Fox-specific tools for service
- Clean rags and isopropyl alcohol
- Torque specs chart (Fox recommended)
Installation Process
Proper installation of the Fox 36 Factory GRIP2 fork is critical to performance and rider safety. Begin by verifying that the fork steerer tube length is compatible with the bike’s headtube and stem stack.
Steerer Tube Cutting and Crown Race Installation:
Before mounting the fork, determine the correct steerer tube length with spacers and headset components in place. Use a pipe cutting guide and fine-tooth hacksaw or a steerer cutting tool. After cutting, file the steerer edge smoothly to prevent headset damage. Press-fit the crown race onto the steerer using a crown race setter, ensuring it seats evenly on the fork crown.
Headset and Frame Interface:
Insert the fork into the headtube, install headset bearings, spacers, and the stem. Tighten the top cap bolt to preload the headset bearings, then secure the stem bolts evenly to spec (5–6 Nm depending on the stem). Verify smooth steering motion and absence of play.
Brake and Wheel Setup:
Install the brake caliper using the correct adapter for rotor size. Align the caliper by loosening its bolts, squeezing the brake lever, and retightening while the lever is pulled. Mount the front wheel and tighten the thru-axle to 18–20 Nm. Verify brake rotor clearance and fork dropout alignment.
Adjustment and Suspension Setup
The GRIP2 damper offers high and low-speed compression and rebound adjusters, allowing full control over ride characteristics.
Air Spring Pressure Setting:
Use the Fox suspension pump to inflate the air spring to the rider’s weight-based recommendation, found in the Fox setup guide. Typical starting pressures range from 60–100 psi. Confirm proper sag by sitting on the bike in riding gear; target 15–20% sag for trail use.
Rebound Adjustment:
Start with rebound settings based on air pressure, then fine-tune after test rides. Turn the red rebound dial clockwise for slower rebound and counterclockwise for faster return. The low-speed rebound primarily affects small bump comfort, while high-speed rebound tunes recovery from impacts.
Compression Damping Control:
Use the blue high-speed and black low-speed compression knobs to control fork stiffness under different conditions. For rough trails, reduce high-speed compression to allow better compliance. Increase low-speed compression for more support during pedaling and cornering.
Maintenance Schedule and Best Practices
Routine maintenance ensures longevity and consistent performance. The Fox 36 Factory GRIP2 is engineered for durability but benefits from regular attention.
Pre-Ride Inspection:
Check for oil residue around the dust seals. Inspect stanchions for scratches or contamination. Wipe down with a clean rag and inspect rebound/compression knobs for smooth rotation.
50-Hour Service:
Perform a lower leg service every 50 hours of ride time. Remove the lowers, clean internal surfaces, and replace bath oil (Fox 20wt Gold). Reinstall new dust wipers if they show wear. Ensure torque settings are followed precisely.
125-Hour Service or Annual Overhaul:
This deeper service includes damper bleed, air spring cleaning, and seal replacement. Use Fox’s specific tools and fluids, or take it to a qualified technician if unfamiliar with damper internals.
Troubleshooting Common Issues
Incorrect setup or component wear can lead to poor performance or unusual fork behavior.
Harsh Ride Feel:
Overly high air pressure or excessive high-speed compression damping can make the fork feel stiff. Lower air pressure slightly and reduce high-speed compression to regain compliance.
Fork Not Rebounding Properly:
If rebound is too slow or inconsistent, inspect the red dial for proper setting. Ensure oil levels are correct and check damper bleed condition during service.
Loss of Travel or Sag Changes:
This may indicate air spring issues such as a leaking air seal or transfer port blockage. Service the air spring assembly and verify that negative and positive chambers are balancing.
Stiction or Reduced Sensitivity:
This is often caused by dry or dirty dust seals. A lower leg service with fresh oil and new seals typically restores full sensitivity.
Customization and Optimization
The GRIP2’s design supports a wide range of tuning options, ideal for riders seeking performance beyond factory recommendations.
Volume Spacers for Progressivity:
Insert volume spacers into the air spring to increase progression and bottom-out resistance. This is ideal for aggressive descents or heavier riders. Removing spacers results in a more linear feel.
Shim Stack Tuning (Advanced):
Experienced riders may revalve the GRIP2’s internal shim stacks for personalized damping curves. This should only be performed by technicians familiar with suspension tuning.
Axle-to-Crown Height Adjustment:
The 36 Factory GRIP2 offers different travel lengths (140mm to 170mm). Adjusting travel affects geometry and can optimize bike handling for climbing or descending.
Compatibility with Other Components
The 36 Factory GRIP2 integrates seamlessly into modern enduro and trail bikes but requires attention to detail for full compatibility.
Brake Rotor Size and Mounting Standards:
It supports 180mm direct mount rotors. Larger rotors require post-mount adapters. Ensure caliper and rotor specs match the bike’s intended use.
Hub Spacing and Axle Standard:
The fork uses a 15x110mm Boost axle. Confirm that your wheelset matches this spacing and includes the appropriate axle hardware.
Tapered Steerer Requirement:
The fork’s 1.5″ to 1-1/8″ tapered steerer tube fits modern frames. Older straight headtube designs require special headsets or adapters.
Comparing with Similar Suspension Forks
To choose the best fork, riders often compare the 36 Factory GRIP2 with other premium models.
Versus RockShox Lyrik Ultimate:
The Lyrik Ultimate is lighter but offers fewer external adjustments than the GRIP2. Riders who prioritize precise tuning may prefer the 36 GRIP2, while those favoring simplicity may opt for the Lyrik.
Versus Fox 38 Factory:
The 38 is stiffer and better suited for aggressive enduro racing or e-bikes. However, the 36 remains the choice for trail riders seeking balance between weight, stiffness, and comfort.
Versus Öhlins RXF36:
Öhlins provides excellent small bump compliance, but the GRIP2 damper surpasses it in adjustability and aftermarket support. Fox also has broader service center availability.
Frequently Asked Questions
How do I know if the Fox 36 Factory GRIP2 fits my bike?
Check your bike’s headtube size, brake mount type, and axle spacing. The fork uses a tapered steerer, Boost axle, and 180mm post-mount brakes.
Can I reduce or increase the fork travel?
Yes, travel can be adjusted internally by changing the air shaft assembly. Travel options range from 140mm to 170mm.
How often should I service the fork?
Perform a lower leg service every 50 hours and a full damper and air spring service every 125 hours or annually.
Why is my fork making a squishing noise?
This is typically normal during compression. However, excessive noise could signal the need for a service due to contaminated oil or worn seals.
Can I use this fork with a non-Boost hub?
No. The Fox 36 Factory GRIP2 requires a 110mm Boost hub. Using a non-Boost hub would compromise alignment and performance.
What is the difference between Factory and Performance series forks?
Factory series forks include Kashima-coated stanchions and the GRIP2 damper for maximum adjustability, while Performance forks use black anodized stanchions and a simpler damper.
Conclusion
The Fox 36 Factory GRIP2 suspension fork is engineered to deliver comfort, control, and customization for demanding riders. With proper installation, setup, and maintenance, it becomes a vital component in elevating trail performance. Whether you are racing enduro or enjoying technical trails, the 36 GRIP2 rewards attention to detail with unmatched suspension response and reliability.