The DHX2 Trunnion [paid link] rear shock by Fox is designed for aggressive riders looking for a high-performance shock to tackle demanding terrains. Known for its exceptional adjustability and robust construction, the DHX2 Trunnion [paid link] offers riders the ability to fine-tune their suspension to meet the unique demands of their riding style and conditions. This guide provides a thorough look into the installation, maintenance, troubleshooting, and optimization of the DHX2 Trunnion, helping you get the most out of this premium shock.

Tools Required

• 8mm and 10mm wrenches
• 5mm Allen key
• Torque wrench [paid link]
• Shock pump
• Fox rebound and compression adjustment tool (if applicable)
• Grease for shock mount bushings
• Clean rag

Installation of the DHX2 Trunnion Rear Shock

Proper installation of the DHX2 Trunnion rear shock is essential for ensuring optimal performance and longevity. Here’s a step-by-step guide to install it correctly:

1. Remove the old shock: If you’re replacing an existing shock, start by removing it from your bike. Use the appropriate tools to loosen and remove the mounting bolts from both ends of the shock. Make sure to support the rear suspension while you remove the shock to prevent damage.
2. Prepare the new shock: Before installing the DHX2, check the shock for any signs of damage and ensure it’s properly lubricated at the mounting points. Apply a light layer of grease to the shock’s eyelet and bushings to reduce friction and prevent wear.
3. Align the shock with the frame: Position the DHX2 Trunnion rear shock in the frame’s shock mount. The trunnion mount design uses a different interface compared to traditional shocks, so ensure that the shock aligns with the frame’s specific mounting system.
4. Secure the shock: Insert the bolts through the shock’s mounting eyelets and the frame’s mounting holes. Tighten the bolts to the manufacturer’s specified torque settings. It is crucial to use a torque wrench [paid link] to prevent overtightening, which could damage the shock or frame.
5. Reinstall the rear wheel: Once the shock is securely installed, reinstall the rear wheel and check for any interference between the shock and the wheel or other parts of the frame.
6. Check suspension sag: Using a shock pump, set the appropriate air pressure based on your weight and riding style. Follow Fox’s recommended guidelines for the DHX2 Trunnion to achieve the correct sag. Sag is an essential measurement, as it ensures your suspension performs optimally.

Adjusting the DHX2 Trunnion Rear Shock

The DHX2 Trunnion rear shock comes with multiple adjustments, allowing you to fine-tune the shock to your liking. These adjustments include compression damping, rebound damping, and air pressure, which all contribute to how the bike handles different types of terrain.

Compression Adjustment

The DHX2 offers separate low-speed and high-speed compression adjustments, allowing you to customize the shock’s performance for specific conditions.

• Low-speed compression: This adjustment affects how the shock responds to slow, controlled movements, like pedaling or small bumps. To adjust, turn the low-speed compression dial clockwise to increase damping, or counterclockwise to reduce it.
• High-speed compression: This setting controls how the shock reacts to fast impacts, such as hitting large rocks or drops. Turn the high-speed compression dial clockwise to stiffen the shock for better control, or counterclockwise to allow more movement for smoother rides on rough terrain.

Rebound Adjustment

Rebound damping controls the speed at which the shock returns after compression. Too fast a rebound can lead to harsh rides, while too slow a rebound can cause the suspension to feel “bogged down.”

• Adjusting rebound: Turn the rebound knob at the bottom of the shock in small increments (clockwise to slow down rebound, counterclockwise to speed it up) until you find the right balance for your riding style.

Air Pressure

Setting the correct air pressure is vital for optimal performance and comfort. Too little air pressure can lead to bottoming out on bigger impacts, while too much can make the shock feel too stiff and uncomfortable.

• Setting air pressure: Use a shock pump to adjust the air pressure in the DHX2 Trunnion. Refer to Fox’s recommended pressure chart based on rider weight and shock setup. Keep in mind that air pressure settings can vary depending on personal preference and riding conditions.

Maintaining the DHX2 Trunnion Rear Shock

Routine maintenance ensures that your DHX2 Trunnion rear shock operates at peak [paid link] performance for years to come. Regular inspection and servicing help prevent issues and extend the lifespan of the shock.

Cleaning and Lubrication

• Clean after each ride: After every ride, wipe down the shock with a clean rag to remove dirt, mud, or debris. Use a damp cloth to clean the shock body and mounting hardware, but avoid using harsh chemicals that could damage the shock.
• Lubricate shock bushings: Apply a small amount of grease to the shock bushings during installation or after cleaning to ensure smooth operation and prevent corrosion.

Regular Inspection

• Check for leaks: Periodically inspect the shock for any signs of oil leakage, particularly around the seals. If you notice any leaking oil, it may indicate a seal failure, and the shock may need to be serviced.
• Inspect mounting bolts: Ensure the mounting bolts are torqued properly, as loose bolts can lead to poor performance and possible damage to the shock or frame.

Fox Service Recommendations

• Service intervals: Fox recommends servicing the DHX2 Trunnion rear shock every 50 hours of riding or once a year, whichever comes first. Regular servicing includes a complete inspection, oil change, and seal replacement.
• Rebuilds and servicing: For a comprehensive rebuild or if you’re unsure how to service your shock, contact a qualified Fox technician or authorized service center.

Troubleshooting Common Set-Up Issues

Despite its advanced design, you may encounter a few common issues with the DHX2 Trunnion rear shock. Here’s how to troubleshoot and resolve them:

Shock Bottoming Out

If the shock is bottoming out frequently, check your air pressure and sag settings. If the air pressure is too low, it can cause the shock to bottom out on bigger impacts. Adjust the air pressure to suit your weight and riding style. Additionally, consider increasing the compression damping to reduce bottoming out.

Unresponsive Rebound

If the rebound feels sluggish or unresponsive, it may be due to a low oil level or contaminated seals. Check the shock for oil leaks, and if needed, perform a full service. Additionally, adjust the rebound setting to ensure it’s within the recommended range.

Poor Pedal Performance

If the shock feels excessively soft or pogo-like during pedaling, increase the low-speed compression. This will help reduce unwanted suspension movement while pedaling and provide a more stable, efficient ride.

Customizing the DHX2 Trunnion Rear Shock for Better Performance

To get the most out of your DHX2 Trunnion rear shock, customizing it to suit your riding style and the terrain you encounter is essential. Here are some tips to optimize the shock for different types of rides:

• For trail riding: Opt for a medium to low compression setting to allow for better small bump absorption while maintaining support on climbs and technical sections.
• For downhill or aggressive riding: Increase both the high-speed compression and air pressure to provide more support on large drops and impacts.
• For cross-country riding: Set the compression damping to the higher end to minimize movement during pedaling, while ensuring the shock can still absorb bigger impacts.

Compatibility with Other Drivetrain Components

The DHX2 Trunnion rear shock is designed to work seamlessly with a variety of mountain bike setups. However, compatibility with other components, such as the rear triangle of the frame and the bike’s overall geometry, is essential.

• Frame compatibility: Ensure that the trunnion mount fits the frame’s shock mounting design. The DHX2 Trunnion is specifically designed for bikes that support trunnion-style shocks, so confirm that your bike frame accommodates this type of mount before installation.
• Drivetrain compatibility: The DHX2 Trunnion does not directly affect drivetrain components. However, ensure that suspension setup doesn’t interfere with your chainline, rear derailleur, or brake setup.

Conclusion

The Fox DHX2 Trunnion rear shock is a versatile [paid link] and highly customizable suspension component designed for riders who demand superior performance. By following the installation and adjustment tips outlined in this guide, you can maximize the potential of this shock, ensuring a smooth and controlled ride no matter the terrain. Regular maintenance and troubleshooting will keep the shock in top condition for years, while customization options allow you to dial in your bike’s suspension to match your riding style.