Fox’s Float X2 Trunnion [paid link] rear shock is a high-performance suspension component that offers superior shock absorption for mountain and road bike riders. To ensure optimal performance and longevity, regular preventative maintenance is crucial. This guide provides a detailed overview of the maintenance process, including installation, adjustment, troubleshooting, customization, and comparison with other models.

Tools Required

• 5mm, 8mm, and 10mm Allen wrenches [paid link]
• Torque wrench [paid link]
• Shock pump (Fox-specific recommended)
• Clean rags or towels
• Fox Float X2 seal kit
• Isopropyl alcohol
• Shock oil (Fox-specific recommended)
• Grease (Fox-specific recommended)
• Suspension grease
• Soft brush

Installation and Initial Setup

Installing the Float X2 Trunnion [paid link] rear shock requires precision to ensure correct performance and longevity. The shock is designed with a trunnion mount that requires specific attention during installation.

Step-by-Step Installation:

1. Remove the Old Shock: If replacing an existing shock, first remove the bike’s rear shock using a 5mm Allen wrench [paid link] to unscrew the shock bolts. Use a torque wrench [paid link] to ensure you do not strip any screws.
2. Clean the Mounts: Before installing the Float X2, clean the shock mounts on the frame. This will ensure proper contact and prevent contaminants from entering the shock system.
3. Align the Shock: Slide the shock into the trunnion mount on the frame. Ensure that the shock aligns correctly with the mounts. The shock’s eyelet should be facing forward for proper positioning.
4. Secure the Shock: Using the appropriate Allen wrench [paid link] (5mm or 8mm), tighten the bolts at the top and bottom of the shock. Follow the manufacturer’s torque specifications for the shock to avoid over-tightening.
5. Inflate the Shock: Use the recommended Fox shock pump to inflate the Float X2 Trunnion to the specified pressure. Refer to the bike’s setup guide or the rider’s weight to adjust pressure appropriately.

Once installed, you can begin testing and adjusting the shock’s settings to fit your specific riding style and terrain.

Adjustment and Tuning

To get the most out of your Float X2 Trunnion rear shock, fine-tuning adjustments are necessary. These adjustments affect how the shock responds to different types of terrain and rider inputs.

Key Adjustments:

1. Air Pressure: The Float X2 Trunnion shock uses air to control the spring rate. Adjust the air pressure based on rider weight, riding style, and terrain. For most riders, this means keeping the shock at about 25-30% sag. Use the Fox shock pump for precise adjustments.
2. Rebound Damping: Rebound controls the shock’s return after compression. Adjusting the rebound damping allows the shock to return at an appropriate speed for the terrain. Set this to a slower setting for rougher terrain and a faster setting for smoother conditions.
3. Compression Damping: The compression adjustment controls how the shock reacts to impacts. The Float X2 features both high and low-speed compression adjustments. Adjust the low-speed compression for small bumps and rider comfort, and the high-speed compression for larger hits and aggressive riding.
4. Bottom-Out Resistance: Fine-tune the shock’s bottom-out resistance to prevent it from bottoming out on large impacts. This is typically adjusted via a separate dial or control on the shock body.

Proper adjustment can significantly enhance your riding experience, making the Float X2 Trunnion a versatile [paid link] shock for various disciplines and terrains.

Preventative Maintenance

Preventative maintenance ensures your Float X2 Trunnion rear shock performs at its best over time. Regular maintenance can also extend the lifespan of the shock.

Cleaning and Lubrication:

1. Clean the Shock Regularly: After each ride, use a clean rag or towel to wipe down the shock. Dirt, mud, and debris can cause wear on the shock seals, which leads to reduced performance.
2. Lubricate the Shock Seals: Lubricate the shock’s seals with a small amount of suspension grease. Be sure not to over-apply, as excess grease can attract dirt and contaminants.

Air Chamber Maintenance:

1. Check for Air Leaks: Periodically check the air chamber for leaks. If you notice a drop in air pressure over time, it may indicate a problem with the seals or air valve. In such cases, consult the Fox Float X2 Trunnion manual or bring the shock to a professional mechanic.
2. Replace Seals and O-Rings: If the shock loses air pressure quickly, inspect the seals and O-rings. Over time, these components wear out, leading to air loss and degraded performance. Replace seals and O-rings with a Fox-specific seal kit to maintain optimal function.

Oil Changes:

The Float X2 Trunnion rear shock requires periodic oil changes to maintain smooth damping performance. Fox recommends replacing the shock oil every 50-100 hours of riding, depending on the riding conditions.

1. Drain Old Oil: Remove the shock from the bike and use a clean towel to catch any residual oil. Remove the shock’s external components to gain access to the oil chamber.
2. Refill with New Oil: Refill the shock with the recommended Fox oil. Be sure to use the appropriate suspension oil for the Float X2 model to avoid issues with viscosity and damping.

Troubleshooting Common Issues

Over time, even with regular maintenance, issues may arise. Here are some common problems with the Float X2 Trunnion and how to address them:

Loss of Air Pressure:

• Problem: If the shock consistently loses air pressure, it’s likely due to damaged seals or an O-ring.
• Solution: Inspect the seals and O-rings for damage. Replace them with a new seal kit, and check the air valve for leaks.

Rebound or Compression Damping Not Working:

• Problem: If the shock is unresponsive to rebound or compression adjustments, the damping circuit may be clogged or compromised.
• Solution: Disassemble the shock and clean the damping circuits. Ensure that no dirt or oil buildup is impeding the shock’s functionality.

Sag Issues:

• Problem: Incorrect sag settings can lead to poor ride performance or discomfort.
• Solution: Adjust the air pressure to ensure that the shock has the correct sag for your weight and riding style.

Customization and Optimization

Riders looking to fine-tune their shock performance can take advantage of additional customization options. Custom tuning of the shock’s damping settings can significantly enhance ride quality and tailor the shock to specific riding conditions.

Custom Tuning Options:

1. Custom Shim Stack Adjustments: Riders can consult with a suspension expert to fine-tune the shim stack inside the shock. Custom shim configurations can change the way the shock handles compression and rebound under specific loads or impacts.
2. Volume Spacers: Adding or removing volume spacers in the air chamber can modify the shock’s progression and overall feel. More volume spacers result in a more progressive spring curve, which is ideal for riders who frequently hit large bumps.

Compatibility with Other Drivetrain Components

The Float X2 Trunnion rear shock is compatible with most modern mountain bike drivetrains, but riders should be mindful of the overall suspension and drivetrain balance. The shock’s tuning should complement the front fork and drivetrain system to ensure a smooth ride.

1. Suspension Fork Compatibility: For optimal suspension performance, ensure that the rear shock’s settings are in harmony with your front fork. Mismatched suspension travel or damping can lead to inconsistent ride quality.
2. Drivetrain Setup: The shock’s performance is less influenced by the drivetrain, but a correctly adjusted drivetrain ensures that pedaling forces are efficiently transmitted to the rear wheel without interference from suspension movement.

Comparison with Similar Models

When comparing the Float X2 Trunnion with other shocks, the most notable competitors include the Fox DHX2 and the RockShox Super Deluxe Coil. While both are excellent options, the Float X2 Trunnion stands out due to its advanced air spring design, which offers precise tuning and adjustability for a wide range of riders and riding conditions.

Key Differences:

• Air vs. Coil: The Float X2 features an air spring, which is lighter and easier to adjust for different riders. The DHX2 and Super Deluxe are coil shocks, which may offer more consistent performance in extreme conditions but at the cost of weight and adjustability.
• Adjustability: The Float X2 provides more adjustability in both low and high-speed compression, making it ideal for riders who require fine-tuned suspension for varied terrain.

Choosing the right rear shock depends on rider preferences, terrain, and intended use. The Float X2 Trunnion is an excellent choice for riders who value adjustability and versatility.