1. Introduction
The FOX 36 Performance Suspension Fork is engineered for aggressive all-mountain riding, providing superior control and performance on descents. This fork integrates advanced features such as the GRIP 3-position damper, an adjustable FLOAT air spring, and precise rebound adjustment to enhance your riding experience.
Its design focuses on maximizing stiffness and strength while minimizing weight, making it ideal for demanding enduro and all-mountain conditions. Key innovations include lower leg bleeders for atmospheric pressure equalization and bypass channels to improve small bump sensitivity and responsiveness.
Figure 1: Front view of the FOX 36 Performance Suspension Fork, showcasing its matte black finish and robust design.
2. Setup
2.1 Unpacking and Initial Inspection
Carefully remove the fork from its packaging. Inspect all components for any signs of damage that may have occurred during shipping. Ensure all included accessories are present.
- Check for any visible dents, scratches, or cracks on the stanchions, lowers, and crown.
- Verify that the axle and any included hardware are present.
- Confirm the steerer tube is straight and undamaged.
2.2 Installation
Proper installation is crucial for safety and performance. If you are unsure about any step, consult a professional bicycle mechanic.
- Prepare the Steerer Tube: Measure and cut the steerer tube to the appropriate length for your bicycle frame and stem setup. Ensure the cut is clean and deburred.
- Install Crown Race: Carefully install the crown race onto the steerer tube.
- Insert Fork into Frame: Slide the steerer tube through the head tube of your bicycle frame.
- Install Headset Components: Assemble the headset components according to your headset manufacturer's instructions.
- Install Stem and Spacers: Place any necessary spacers and then your stem onto the steerer tube.
- Secure Top Cap: Install the top cap and bolt, tightening it to remove play from the headset, but do not overtighten.
- Align and Tighten Stem: Align the stem with the front wheel and tighten the stem bolts to the manufacturer's recommended torque specifications.
- Install Front Wheel: Insert the 15mm Thru x 110mm front axle through the wheel hub and fork dropouts. Secure the axle firmly.
- Install Brake Caliper: Mount your disc brake caliper to the Post Mount 180 tabs on the fork lower leg. Ensure proper alignment and torque the bolts to the brake manufacturer's specifications.
Figure 2: Side view of the fork, highlighting the 15QR x 110mm axle and brake mount points.
3. Operating Instructions
3.1 Air Spring Adjustment (FLOAT)
The FLOAT air spring allows for precise tuning of the fork's feel based on rider weight and preference. Refer to the FOX website for detailed air pressure charts specific to your fork model and rider weight.
- Remove the blue air cap on the top of the left fork leg.
- Attach a high-pressure shock pump.
- Add or release air pressure to achieve the desired sag and feel.
- Replace the air cap.
3.2 GRIP Damper Adjustment (3-Position)
The GRIP damper features a 3-position lever (Open, Medium, Firm) to quickly adapt the fork's compression damping to varying terrain and riding styles.
- Open Mode: Provides full suspension travel for maximum bump absorption on rough descents.
- Medium Mode: Offers increased compression damping for improved pedaling efficiency and control on mixed terrain.
- Firm Mode: Provides a firm platform for climbing and smooth sections, minimizing suspension movement.
Figure 3: Top view of the fork crown, illustrating the GRIP damper adjustment lever.
3.3 Rebound Adjustment
Rebound damping controls the speed at which the fork extends after compression. The red knob at the bottom of the right fork leg adjusts rebound.
- Turn the knob clockwise for slower rebound (more damping).
- Turn the knob counter-clockwise for faster rebound (less damping).
- Adjust to prevent the fork from packing up on successive bumps or feeling too bouncy.
3.4 Lower Leg Bleeders
The lower leg bleeders allow for atmospheric pressure equalization at the push of a button, improving fork performance by increasing small bump sensitivity and responsiveness.
- With the bike upright, gently press the small buttons on the back of the lower legs to release any built-up pressure.
- Perform this regularly, especially after significant changes in altitude or temperature.
4. Maintenance
Regular maintenance ensures optimal performance and extends the lifespan of your FOX 36 Performance fork. Always use FOX-approved lubricants and tools.
4.1 Cleaning
- After every ride, wipe down the stanchions and seals with a clean, soft cloth to remove dirt and debris.
- Use mild soap and water for general cleaning of the fork lowers and crown. Avoid high-pressure washers directly on seals.
- Do not use harsh chemicals or solvents, as they can damage seals and finishes.
4.2 Regular Checks
- Air Pressure: Check air pressure before every ride and adjust as needed.
- Bolt Torque: Periodically check the torque of all bolts (axle, brake caliper, stem) to ensure they are tightened to specifications.
- Bushings and Seals: Inspect for any signs of wear, leaks, or excessive play.
4.3 Service Intervals
FOX recommends regular service to maintain performance and warranty validity. Refer to the official FOX website for the most current service schedules.
- Lower Leg Service: Typically recommended every 50 hours of riding or annually, whichever comes first. This involves cleaning and lubricating the dust wipers, foam rings, and replacing bath oil.
- Full Fork Service: Recommended every 125 hours of riding or annually. This includes a complete disassembly, inspection, and replacement of all seals, O-rings, and fluids.
For detailed service procedures, visit the official FOX Service website: www.ridefox.com/service
5. Troubleshooting
This section addresses common issues you might encounter with your FOX 36 Performance fork. For more complex problems, contact FOX customer support or a certified service center.
| Problem | Possible Cause | Solution |
|---|---|---|
| Fork feels harsh or not getting full travel. | Too much air pressure; air trapped in lower legs; too much compression damping. | Reduce air pressure; use lower leg bleeders; reduce compression damping. |
| Fork feels too soft or bottoms out easily. | Too little air pressure; too little compression damping. | Increase air pressure; increase compression damping. |
| Fork is noisy (creaking, clunking). | Loose headset; dry bushings; loose axle. | Check headset adjustment; perform lower leg service; ensure axle is properly torqued. |
| Oil leaking from seals. | Damaged or worn seals; excessive dirt buildup. | Clean stanchions and seals; replace seals (lower leg service). |
6. Specifications
Detailed technical specifications for the FOX 36 Performance Suspension Fork, Model 910-21-338.
| Feature | Value |
|---|---|
| Model | FOX 36 Performance |
| Part Number | 910-21-338 |
| Wheel Size | 29" |
| Travel | 160 mm |
| Axle Standard | 15QR x 110 mm (Boost) |
| Offset | 44 mm |
| Damper | GRIP, 3-Position |
| Air Spring | FLOAT |
| Steerer Type | Tapered |
| Stanchion Diameter | 36 mm |
| Brake Type | Post Mount 180 |
| Color | Matte Black |
| Item Weight | 7.25 Pounds (approx. 3.29 kg) |
| Item Dimensions (LxWxH) | 38.15 x 8.99 x 4.55 inches |
7. Warranty and Support
FOX Factory products are manufactured to the highest standards and come with a limited warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the official FOX Factory website.
For technical support, service inquiries, or to find an authorized service center, please visit:
Always provide your product's model number (910-21-338) and serial number when contacting support to expedite assistance.