The Fox Float X2 Trunnion [paid link] rear shock is a high-performance component designed for aggressive trail riders and downhill enthusiasts. With its advanced damping system and precise adjustability, the Float X2 Trunnion [paid link] allows riders to fine-tune their suspension to match their specific riding style and terrain. Whether you are upgrading your bike or simply looking to optimize your shock’s performance, this guide will provide detailed instructions for installation, adjustment, maintenance, and troubleshooting of the Float X2 Trunnion.
Tools Required
- 5mm and 6mm Allen wrenches [paid link]
- Torque wrench [paid link] (5-30 Nm range)
- Shock pump
- Flathead screwdriver
- Suspension oil (Fox Float fluid)
- Clean cloth or rag
- Zip ties (for maintenance purposes)
- Measuring calipers (for sag measurement)
Installation of the Float X2 Trunnion Rear Shock
Installing the Float X2 Trunnion rear shock correctly is essential for optimal performance. Here’s how to do it:
- Remove the Old Shock: If replacing an old shock, use a 5mm Allen wrench [paid link] to remove the bolts securing the shock to the frame. Make sure to save the hardware if it’s still in good condition.
- Prepare the Shock Mount: Inspect the mounting hardware on the frame to ensure it is clean and free from dirt or debris. Use a clean cloth to wipe down the mounting surfaces.
- Install the Float X2 Trunnion: Slide the shock’s trunnion mount into place. Ensure the eyelet is aligned with the shock mount on the frame. Tighten the mounting bolts with a 6mm Allen wrench [paid link], ensuring they are torqued to the manufacturer’s specifications (typically 8-12 Nm).
- Check for Movement: After securing the shock, check for smooth movement in the rear triangle. There should be no binding or excessive friction. If the shock moves stiffly, check the mounting bolts for correct torque.
Setting Up the Float X2 Trunnion Rear Shock
Once the Float X2 Trunnion is installed, setting it up properly is crucial for performance. The Float X2 offers a range of adjustments to tailor the shock to your preferences. Here are the key settings you should adjust:
1. Sag Setting
The sag is the amount the shock compresses under the rider’s weight. It’s critical to set the sag properly to maintain optimal suspension performance.
- Step 1: Use a shock pump to set the air pressure to the manufacturer-recommended value based on your weight.
- Step 2: Use a zip tie around the shock stanchion to measure sag while sitting on the bike in riding position.
- Step 3: Adjust the air pressure using the shock pump if necessary. A typical starting point is 30% sag for aggressive riders and 25% for more trail-oriented riders.
2. Rebound Adjustment
The rebound setting controls how quickly the shock returns to its normal position after compression. Too fast or too slow can lead to instability.
- Step 1: Locate the rebound knob on the shock.
- Step 2: Turn the knob clockwise (slower rebound) or counterclockwise (faster rebound) to achieve the desired rate of return.
- Step 3: Adjust based on your preferences. A good starting point is to have the rebound set at a medium position, then adjust based on feedback from the trail.
3. Compression Adjustment
The Float X2 offers two types of compression settings: low-speed and high-speed compression. These adjust how the shock responds to different types of impacts.
- Step 1: Find the low-speed compression adjuster (usually a blue dial) and set it to a medium position.
- Step 2: Set the high-speed compression (usually a red dial) to its factory setting.
- Step 3: Test the suspension on different terrain. If you feel bottoming out, increase compression. If the ride is too harsh, reduce compression for a smoother feel.
4. Lockout Mechanism
The Float X2 Trunnion includes a lockout feature that helps reduce pedal bob on smooth climbs.
- Step 1: Engage the lockout by turning the knob to the “lock” position.
- Step 2: Disengage the lockout by turning the knob to the “open” position for descents or technical terrain.
Troubleshooting Common Set-Up Issues
Even with precise installation and tuning, you may encounter some common issues with the Float X2 Trunnion rear shock. Here are the most common problems and how to address them:
1. Excessive Bottoming Out
If you’re experiencing bottoming out frequently, it could indicate too little air pressure or insufficient compression damping.
- Solution: Increase the air pressure by small increments using a shock pump. Additionally, consider tightening the compression settings to prevent the shock from bottoming out during aggressive descents.
2. Harsh Ride or Poor Small-Bump Sensitivity
A harsh ride or difficulty absorbing smaller impacts may be due to overly stiff settings.
- Solution: Lower the air pressure to allow for more sag, and reduce the compression damping, particularly on the low-speed setting, to improve sensitivity to small bumps.
3. Too Much Pedal Bob
If you notice excessive pedal bob while climbing, especially in technical sections, it’s likely the shock is too active.
- Solution: Engage the lockout feature on the shock or increase the low-speed compression setting to reduce pedal movement.
4. Uneven Rebound
If the shock is rebounding too quickly or too slowly, it may cause instability, particularly in rough terrain.
- Solution: Adjust the rebound dial. For a smoother ride, slow down the rebound by turning the knob clockwise. Conversely, speed it up by turning the knob counterclockwise.
Maintenance of the Float X2 Trunnion Rear Shock
Regular maintenance of the Float X2 Trunnion is essential for keeping it functioning optimally and prolonging its lifespan. Here’s what you need to do:
1. Regular Cleaning
After every ride, it’s important to clean your shock. Use a clean, damp cloth to wipe down the shock’s body and stanchion. This prevents dirt and grime from building up and damaging the shock seals.
2. Lubrication
Every few rides, add a drop of suspension oil (Fox Float fluid) to the stanchion to keep the seals lubricated. This will prevent excessive wear and keep the shock performing smoothly.
3. Air Pressure Checks
Air pressure naturally decreases over time, so be sure to check and adjust the air pressure before each ride. This ensures the correct sag and suspension performance.
4. Annual Service
At least once a year, or after approximately 100-150 hours of riding, it’s recommended to send the shock in for a full service. Fox’s authorized service centers can replace worn-out seals and perform more detailed maintenance.
Customization and Optimization for Better Performance
For riders looking to optimize the Float X2 Trunnion’s performance, there are a few advanced tuning options available:
1. Custom Shims
Fox offers custom shim kits for more precise control over the compression and rebound curves. By swapping out the standard shims for specific configurations, you can fine-tune how the shock behaves under various riding conditions.
2. High-Volume Air Can Upgrade
For riders seeking additional bottom-out resistance, upgrading to a high-volume air can is a great way to improve the shock’s performance on rougher trails. This modification provides a more progressive feel and reduces harsh bottoming.
Comparison with Other Rear Shocks
When compared to other rear shocks in its class, such as the RockShox Super Deluxe or the DVO Jade X, the Float X2 Trunnion stands out for its extensive adjustability and consistent performance across a variety of terrains. While the RockShox Super Deluxe offers a more user-friendly experience with its tool-free adjustments, the Float X2 provides finer control over suspension settings, making it the preferred choice for riders who demand more precision and customization.
Compatibility with Other Drivetrain Components
The Float X2 Trunnion is compatible with most modern mountain bike frames that have the necessary trunnion mount and the right shock length and stroke specifications. Ensure that your frame is designed to accommodate a trunnion-style shock before installation. Additionally, the shock pairs well with a wide range of drivetrains, including SRAM and Shimano systems, as long as the frame allows for proper shock mounting.
By understanding the installation, tuning, and maintenance processes for the Float X2 Trunnion, riders can unlock its full potential for optimal performance. Regular adjustments and careful attention to the shock’s settings will ensure a smooth and responsive ride, regardless of the terrain.