The Fox DHX2 Trunnion [paid link] rear shock is a high-performance suspension component that is designed to provide exceptional ride quality, durability, and adjustability. Its innovative design and features make it stand out in the competitive world of rear shocks. Whether you are looking to install, adjust, maintain, or troubleshoot your DHX2 Trunnion [paid link], this guide will give you the detailed information you need to get the most out of your suspension system.

Installation of the DHX2 Trunnion Rear Shock

Tools Required:

• 5mm and 6mm Allen wrenches [paid link]
• Torque wrench [paid link]
• 8mm or 10mm socket (depending on the frame)
• Fox shock pump
• Safety gloves
• Clean cloth

Steps:

1. Remove the Old Shock: If you’re replacing an existing rear shock, start by removing it from the frame. Use a 5mm or 6mm Allen wrench [paid link] to unscrew the bolts securing the shock to the frame. Be sure to keep the bolts as you will need them for the new shock.
2. Prepare the DHX2 Trunnion: Before installation, inspect the DHX2 shock to ensure there is no damage and that the seals are intact. Check the air pressure by attaching the Fox shock pump and adjusting it as necessary.
3. Install the Trunnion Shock: Align the DHX2 Trunnion with the mounting hardware on the frame. Insert the shock into its proper position, ensuring that it fits securely into the mounting eyelets.
4. Secure the Shock: Use the appropriate Allen wrench [paid link] to tighten the bolts. Follow the manufacturer’s recommended torque specifications (typically around 200-250 in-lb for the shock bolts). Make sure that the bolts are tightened evenly to prevent misalignment.
5. Check for Smooth Movement: After the shock is secured, check the suspension travel. Ensure that there are no binding points or excessive friction in the shock’s movement.

Adjusting the DHX2 Trunnion Rear Shock

The Fox DHX2 Trunnion rear shock comes equipped with several adjustability features that allow riders to fine-tune their suspension to suit different terrains and riding styles. Here’s how to adjust the shock settings:

Rebound Adjustment:

The DHX2 features a rebound knob located at the bottom of the shock. This knob controls how quickly the shock returns to its original position after compression.

• Clockwise: Slows down the rebound, providing more control on rough terrain.
• Counterclockwise: Increases the rebound speed for a quicker return.

Start with the rebound set at the middle setting, and make small adjustments based on the terrain you’re riding on. Slower rebound settings are typically better for technical descents, while faster settings work well for smoother trails.

Compression Adjustment:

The compression adjustments on the DHX2 Trunnion rear shock include both low-speed and high-speed settings.

• Low-Speed Compression: This controls how the shock compresses during slow movements, like when you climb or make tight turns. Turn the knob clockwise to increase compression, which reduces sag.
• High-Speed Compression: This controls how the shock responds during fast, aggressive impacts. Increasing the high-speed compression helps prevent bottoming out when hitting large drops or big hits.

Adjust both compression settings gradually to find the balance that suits your riding style. A good baseline for most riders is setting the low-speed compression about halfway, while high-speed compression should be adjusted based on the type of terrain.

Maintaining the DHX2 Trunnion Rear Shock

Proper maintenance of the DHX2 Trunnion rear shock ensures it performs optimally and lasts longer. Follow these steps to keep your shock in top condition.

Routine Cleaning:

• After each ride, wipe the shock clean with a soft cloth to remove dirt and debris that could damage the seals.
• Avoid using solvents or aggressive cleaners, as these can deteriorate the shock’s seals and coatings.

Air Pressure Checks:

• Regularly check the air pressure in the shock using the Fox shock pump. Keep the shock pressure within the recommended range to ensure optimal performance.
• Adjust the air pressure based on your body weight, riding style, and terrain. Remember to recheck air pressure frequently, especially after hard rides or when adjusting other shock settings.

Seal Care:

• Periodically check the seals for any signs of wear or leakage. If you notice any oil leaks or degraded seals, it’s important to replace them to prevent dirt and moisture from entering the shock.
• Fox recommends servicing the seals and air can once a year, depending on how frequently you ride.

Troubleshooting Common DHX2 Trunnion Issues

Issue: Shock Bottoming Out

• Cause: If the shock bottoms out frequently, it may be due to insufficient air pressure or improper compression settings.
• Solution: Increase the air pressure slightly and adjust the high-speed compression to offer more resistance to large impacts.

Issue: Unresponsive Rebound

• Cause: If the shock rebounds too quickly or too slowly, it could be due to incorrect rebound settings or low oil levels.
• Solution: Adjust the rebound to ensure a smooth and controlled return. If the issue persists, consider servicing the shock to check for oil issues.

Issue: Leaking Oil

• Cause: Oil leaks often indicate damaged seals or an over-pressurized shock.
• Solution: Inspect the seals for damage. If necessary, replace them and adjust the air pressure within the recommended range.

Customizing the DHX2 Trunnion for Better Performance

The DHX2 Trunnion rear shock is designed for riders who demand high performance and precise handling. Here are some tips for customizing the shock to improve your riding experience:

• Adjust Air Pressure Based on Riding Style: Riders who focus on downhill or aggressive trails should increase the air pressure to prevent bottoming out. For XC riders or those who prefer smoother terrain, slightly lower air pressure may provide a more supple feel.
• Tuning Compression for Specific Terrain: If you regularly ride on technical terrain with sharp impacts, increasing both low and high-speed compression can help absorb large bumps while preventing excessive shock travel. Conversely, riders focused on flowy trails might want a more supple setup with lower compression settings.

Compatibility with Other Drivetrain Components

The DHX2 Trunnion is compatible with a wide range of mountain bike frames, though it is important to confirm that the shock’s measurements match your bike’s requirements. The trunnion mount design requires specific frame compatibility, so check the frame manufacturer’s specifications to ensure a proper fit. The DHX2 can be paired with any drivetrain, but riders may want to consider balancing the shock’s settings with the performance of their drivetrain for optimal ride quality.

Comparison with Similar Models

While the Fox DHX2 Trunnion rear shock is highly regarded for its performance and adjustability, it is important to compare it to other options on the market to ensure it’s the right fit for your needs.

• Fox Float X2: The Float X2 is a lighter shock compared to the DHX2, making it a good choice for cross-country and trail riders who need a high-performance, lightweight shock. However, the DHX2 excels in providing more customization and superior damping for aggressive riders.
• RockShox Super Deluxe: Another competitor, the RockShox Super Deluxe, offers similar features with a slightly lower price point. However, the DHX2’s durability and high-end performance in extreme conditions give it an edge for more aggressive riders.

Ultimately, the DHX2 Trunnion stands out for its extensive tunability, robust construction, and ability to handle the most demanding riding styles, particularly for riders who focus on downhill and enduro disciplines.