Fox Racing Shox’s Float X2 Trunnion [paid link] rear shock is a high-performance component designed for riders looking to maximize their bike’s suspension capabilities. Offering exceptional damping control and improved ride quality, the Float X2 Trunnion [paid link] is a popular choice for riders who need a shock that can handle aggressive trails, technical descents, and varied terrain. This guide will walk you through the installation, adjustment, maintenance, troubleshooting, and optimization of the Float X2 Trunnion rear shock, as well as help you understand its compatibility with other drivetrain components.

Installation of the Float X2 Trunnion Rear Shock

Installing the Float X2 Trunnion rear shock requires precise steps to ensure that the shock is properly aligned and securely mounted to your frame. A well-executed installation will help achieve optimal performance and prevent damage to the shock or bike frame.

Tools Required:

• 5mm Allen wrench [paid link]
• Torque wrench [paid link]
• Fox suspension air pump
• Isopropyl alcohol
• Clean rags
• Shock bushings (if necessary)

Installation Steps:

1. Prepare the Bike Frame:
   • Clean the area around the shock mounting points with isopropyl alcohol to remove dirt and debris.
   • Check that the frame’s mounting points are free from damage and that the bushings are in good condition.
2. Remove the Old Shock (if replacing):
   • Use a 5mm Allen wrench [paid link] to remove the bolts securing the old shock to the frame.
   • Carefully slide the old shock out of the mounting position.
3. Insert the New Float X2 Trunnion Shock:
   • Position the Float X2 Trunnion rear shock into the mounting location, ensuring the trunnion mount lines up with the frame’s rear shock mount.
   • Align the mounting holes and insert the mounting bolts.
4. Secure the Shock:
   • Tighten the bolts by hand to ensure proper alignment.
   • Use a torque wrench [paid link] to tighten the bolts to the recommended specifications, usually around 8-10 Nm for the shock mounting bolts.
5. Inflate the Shock:
   • Using the Fox suspension air pump, inflate the Float X2 Trunnion rear shock to the recommended pressure based on your rider weight and the specific bike setup. This will vary depending on the type of riding you plan to do.
6. Check for Play or Movement:
   • Double-check all mounting points and bolts for proper torque.
   • Push and pull on the shock to ensure it’s securely mounted with no movement.

Adjustment of the Float X2 Trunnion Rear Shock

The Float X2 Trunnion rear shock comes with various tuning features that allow riders to customize the suspension feel. Proper adjustment can make a significant difference in the ride quality and performance of your bike, particularly when tackling different types of terrain.

Air Pressure

• Set the initial air pressure based on your weight. Fox provides a guide with their shock, but generally, you’ll want to start with an air pressure that gives you around 25-30% sag when you sit on the bike in a riding position.
• Use the Fox suspension air pump to adjust the pressure. Make sure to check for any air leaks before proceeding to other adjustments.

Rebound Adjustment

• The rebound knob on the Float X2 Trunnion rear shock controls how quickly the shock returns to its original position after compression.
• Turn the rebound knob to adjust the speed. For most riders, a mid-range setting is ideal.
• Fine-tune the rebound setting depending on the terrain you ride on. Faster rebound is ideal for smoother trails, while slower rebound is better for rougher terrain.

Compression Damping

• The Float X2 Trunnion features separate high-speed and low-speed compression adjustments.
• Low-Speed Compression: This adjustment controls the shock’s resistance to compression at slow speeds (e.g., when pedaling or riding over small bumps). Set this to a middle or slightly firmer setting to improve pedaling efficiency.
• High-Speed Compression: This controls compression during more aggressive impacts, like drops and fast descents. Set it to a stiffer setting if you’re riding on technical or rough terrain, but ensure it doesn’t feel too harsh.

Volume Spacers

• The Float X2 Trunnion rear shock allows you to adjust the internal volume with spacers. Adding spacers will make the shock feel more progressive, reducing bottom-out resistance during aggressive riding.
• Remove or add spacers based on your preference. If you’re landing big drops, consider using more spacers for a progressive feel.

Maintenance of the Float X2 Trunnion Rear Shock

Routine maintenance ensures that your Float X2 Trunnion rear shock performs optimally and lasts for many rides. Regular cleaning, lubrication, and servicing of the shock will prevent premature wear and keep the shock functioning like new.

Cleaning the Shock

• After each ride, wipe down the shock with a clean, dry rag to remove dirt and mud.
• For more thorough cleaning, use a rag lightly dampened with isopropyl alcohol to clean the shock body, seals, and mounting points.

Checking for Leaks

• Inspect the shock for any visible signs of oil leaks, especially around the seals.
• If you notice oil leaking from the shock, it may need servicing.

Lubricating Seals

• Use a light suspension grease to lubricate the seals at regular intervals. This helps ensure smooth operation and reduces the chances of dust and dirt getting inside the shock.

Air Spring Servicing

• Over time, the air spring may lose some of its performance. You should check and top off the air pressure periodically based on your riding needs.
• If you notice any significant loss of air pressure or poor rebound, consider servicing the air spring or replacing the seals.

Troubleshooting Common Set-Up Issues

Insufficient Rebound or Compression Damping

• Possible Cause: The rebound or compression settings might be incorrectly adjusted.
• Solution: Review the recommended settings and adjust the rebound and compression to your preferences.

Air Leaks or Loss of Air Pressure

• Possible Cause: Leaks in the shock or valve may cause air loss.
• Solution: Inspect the shock for any visible signs of damage. If the valve is leaking, check the valve core for tightness. If the problem persists, the shock may need to be serviced.

Rough or Sticky Shock Movement

• Possible Cause: Dirt or debris in the shock’s internals or on the seals can cause rough movement.
• Solution: Clean the shock thoroughly and ensure that the seals are well-lubricated. If the problem continues, consider having the shock serviced professionally.

Customization and Optimization for Better Performance

Riders often customize their suspension for specific needs, whether for racing, technical trails, or long endurance rides. Optimizing your Float X2 Trunnion rear shock can significantly enhance comfort and performance.

Fine-Tuning for Race Performance

• Use firmer compression settings and high rebound adjustments for maximum control during high-speed riding.
• Consider using volume spacers for a more progressive feel during aggressive hits.

Comfort for Endurance Riding

• Opt for a more plush setup with lower compression and softer rebound settings for long-distance comfort.
• A slightly softer air spring will help smooth out smaller bumps, allowing for better fatigue resistance during extended rides.

Compatibility with Other Drivetrain Components

The Float X2 Trunnion rear shock is compatible with most modern mountain bike frames and drivetrain components, including those with 12-speed drivetrains. However, compatibility with specific bikes may vary depending on factors like rear triangle design and shock mount configurations.

Ensure your frame has the correct trunnion mount size to fit the Float X2 Trunnion shock. Some bikes may require additional adapters or custom shock bushings to ensure a proper fit. Always check your bike’s specifications before installation.

Conclusion

The Float X2 Trunnion rear shock from Fox is a top-tier suspension component that offers riders exceptional control, durability, and comfort. Whether you’re upgrading from a basic shock or fine-tuning your setup for a specific type of riding, the Float X2 Trunnion provides the versatility and performance needed to tackle the toughest trails. By following the installation, adjustment, and maintenance steps outlined in this guide, you can maximize the potential of your rear shock and enjoy a smoother, more responsive ride.