The Fox Float X2 Trunnion [paid link] Rear Shock is one of the most advanced suspension components available for mountain biking. It plays a pivotal role in ensuring that your bike offers the best possible ride, enhancing comfort, control, and performance. This article will delve into the installation, adjustment, and maintenance of the Float X2 Trunnion [paid link], troubleshoot common set-up issues, and discuss how to optimize it for superior performance. Additionally, we will compare it to similar models and explore its compatibility with other drivetrain components to help you understand why the Float X2 Trunnion is an excellent choice for serious riders.

Tools Required

• Fox Float X2 Trunnion Rear Shock
• Torque Wrench [paid link]
• 5mm and 6mm Hex Wrenches
• 8mm Wrench
• Suspension Pump
• High-quality grease (suspension-specific)
• Teflon tape (optional, for sealing)
• Measuring tape

Installation of the Float X2 Trunnion Rear Shock

Installing the Fox Float X2 Trunnion Rear Shock involves precise attention to detail to ensure that it functions optimally. The shock should be installed with proper torque settings and alignment for maximum efficiency.

Step-by-Step Installation

1. Prepare the bike: Ensure that your frame is clean and free of any dirt or debris, particularly where the shock will be mounted. It is essential to start with a clean setup to avoid any contaminants that may hinder the shock’s performance.
2. Remove the old shock (if applicable): If you are replacing an old shock, remove it from the bike frame by loosening the bolts with the correct hex wrenches. Ensure you keep the bolts in a safe place for reinstallation if you’re using them for the new shock.
3. Install the trunnion mount: The trunnion mount of the Float X2 is designed for a more compact, high-performance suspension. Align the trunnion with the mounting points on the frame. Insert the mounting bolts and tighten them to the specified torque setting (usually between 7-10 Nm for the trunnion bolts, but verify with your frame’s specifications).
4. Torque settings: Use a torque wrench [paid link] to ensure that the mounting bolts are tightened to the correct settings. Over-tightening or under-tightening can affect the shock’s performance and durability.
5. Attach the rear linkage: Once the shock is installed, connect the rear linkage to the shock’s other mounting point. Ensure the linkage is properly aligned and securely fastened.
6. Install the air sleeve: The air sleeve of the Float X2 Trunnion Rear Shock should be inflated according to the rider’s weight and riding style. Use a suspension pump to add the required air pressure (check Fox’s recommended settings or your personal setup preferences).
7. Final checks: Before you take the bike out for a ride, double-check all fasteners to ensure everything is securely tightened. Check that there is no play in the shock or linkage.

Adjustment of the Float X2 Trunnion Rear Shock

Once the Float X2 Trunnion Rear Shock is installed, it is crucial to fine-tune its settings to match your riding style and terrain. Proper adjustments can significantly enhance ride quality.

Key Adjustments to Consider

1. Rebound Dampening: Adjust the rebound dampening to control the shock’s ability to return after compression. For smoother terrain, you can opt for a faster rebound setting. For rougher or more technical trails, a slower rebound will help maintain better control.
2. Compression Dampening: The Float X2 features both low-speed and high-speed compression adjustment. Low-speed compression affects the shock’s performance during gradual suspension movements (like pedaling). High-speed compression, on the other hand, regulates how the shock reacts to quick hits (such as landing jumps). Adjust these settings based on your riding preferences.
3. Air Pressure: Set the air pressure using the suspension pump according to your weight and riding style. This is one of the most critical adjustments as it affects overall suspension performance. Higher air pressure increases the shock’s responsiveness, while lower pressure offers more comfort and better traction.
4. Volume Spacers: The Float X2 allows for the addition or removal of volume spacers to adjust bottom-out resistance. Adding spacers increases progression, preventing the shock from bottoming out too easily on big hits. Removing spacers will make the shock feel more linear and plush.
5. Sag Setting: Set the sag by measuring how much the shock compresses under your weight when sitting on the bike. Aim for around 30% sag, which provides a balance between comfort and performance. Too much sag can make the shock feel too soft, while too little will lead to a harsh ride.

Maintenance of the Float X2 Trunnion Rear Shock

Proper maintenance ensures that the Fox Float X2 Trunnion Rear Shock performs consistently and lasts for years.

Routine Maintenance Tips

1. Clean after each ride: After riding, use a clean cloth to wipe down the shock and remove any dirt or debris. Pay special attention to the air valve and the area around the shock eyelets.
2. Check air pressure regularly: Over time, air pressure can decrease due to natural seepage. Check the air pressure before every ride, and adjust it according to your weight and preferences.
3. Lubricate moving parts: Apply suspension-specific grease to the mounting hardware to reduce friction and prevent wear. Ensure that the bushings and seals are in good condition.
4. Service intervals: Fox recommends performing a full shock service every 100 hours of riding, or once a year, whichever comes first. This includes replacing seals, checking the oil levels, and inspecting internal components for wear and tear.

Troubleshooting Common Set-up Issues

1. Shock bottoming out: If the shock bottoms out too easily, try adding a volume spacer or increasing air pressure. Adjust the compression settings to suit your riding style.
2. Excessive sag: If you notice too much sag, check that you are using the correct air pressure for your weight. You may need to increase the air pressure or add spacers to prevent excessive sag.
3. Poor rebound performance: If the rebound feels too slow or too fast, adjust the rebound dampening knob. A fast rebound can make the ride bouncy and unstable, while a slow rebound can feel sluggish and uncomfortable.

Customization and Optimization for Better Performance

The Float X2 Trunnion Rear Shock can be customized in several ways to optimize your bike’s performance:

1. Fine-tune air pressure: For different types of trails, you may need to adjust your air pressure. Lower pressure provides better traction and comfort, while higher pressure offers more responsiveness and support for aggressive riding.
2. Experiment with compression settings: Riders who tackle mixed terrain can adjust the low-speed compression for pedaling efficiency while fine-tuning the high-speed compression for rough trails and drops.
3. Upgrade with Fox’s proprietary components: Consider pairing the Float X2 with Fox’s other suspension components (forks, shocks) for a completely integrated system. This ensures that all components are working in harmony to provide the best performance.

Comparison with Similar Models

While the Float X2 Trunnion Rear Shock excels in many aspects, it’s important to understand how it compares to other rear shocks in the market.

• Fox DHX2 vs Float X2: The DHX2 offers superior control on downhill trails due to its coil design, while the Float X2 is air-based, providing a lighter and more tunable option for most riders.
• RockShox Super Deluxe Coil vs Float X2: The Super Deluxe Coil is also a great choice for aggressive riders, but the Float X2 offers more customization options, including easier tuning with air pressure adjustments.

Compatibility with Other Drivetrain Components

The Fox Float X2 Trunnion Rear Shock is compatible with a wide range of mountain bike frames and drivetrain components. However, it’s essential to ensure that the shock’s dimensions align with the bike frame, particularly in terms of mounting points. Most modern mountain bike frames, especially those designed for aggressive riding, will be compatible with the Float X2, but always verify frame compatibility before purchase.

In conclusion, the Float X2 Trunnion Rear Shock is an advanced and highly customizable component that enhances ride quality and overall bike performance. With proper installation, tuning, and maintenance, it provides superior control and comfort across various trail conditions.