The Fox DHX2 Trunnion [paid link] rear shock is a top-tier performance shock designed for downhill and enduro bikes. Known for its outstanding durability, customization options, and versatility, the DHX2 is highly favored by competitive riders and enthusiasts alike. This article will explore its installation, adjustment, maintenance, troubleshooting, and compatibility, offering a comprehensive guide for those looking to optimize their bike’s performance.

Installation of the DHX2 Trunnion Rear Shock

The installation of the DHX2 Trunnion [paid link] rear shock requires attention to detail to ensure a smooth setup. The shock is designed to be mounted in frames that support trunnion mounts, so it’s crucial to verify compatibility with your bike’s frame before proceeding.

Tools Required:

• 5mm and 6mm hex wrenches
• Torque wrench [paid link]
• 8mm socket wrench
• 10mm socket wrench
• Loctite threadlocker (for mounting bolts)
• Shock pump

Installation Steps:

1. Prepare the bike frame: Ensure the mounting points on the frame are clean and free of debris.
2. Mount the trunnion shock: Align the trunnion mount with the corresponding frame mount on the bike. Insert the mounting bolts through the trunnion and secure them.
3. Tighten the bolts: Use a torque wrench [paid link] to tighten the bolts to the manufacturer-recommended torque specifications. This ensures that the shock is securely mounted without risking damage to the frame.
4. Install the damper settings: Depending on the DHX2 model, you may have different options for external adjustments. Ensure all damper dials (compression, rebound) are in their neutral positions before setting them later.
5. Install the air canister: Use a shock pump to inflate the air spring to the desired pressure. Start with a pressure setting based on your rider weight, and adjust from there.

Adjustment and Customization of the DHX2 Trunnion Rear Shock

One of the standout features of the Fox DHX2 Trunnion rear shock is its exceptional adjustability. With options for high- and low-speed compression, rebound, and air spring pressure, riders can fine-tune the shock to their exact preferences and riding style.

Adjusting Rebound:

• Purpose: Controls how quickly the shock returns after compressing.
• How to Adjust: Turn the rebound dial (located at the bottom of the shock) clockwise to slow the rebound or counterclockwise to speed it up. Start with a neutral setting and make adjustments based on trail feedback.

Adjusting Compression:

• Purpose: Controls the shock’s resistance to compression during impacts.
• How to Adjust: The DHX2 features separate high-speed and low-speed compression adjustments. The low-speed compression dial is generally used for small bumps and trail chatter, while the high-speed compression dial is for large hits. Make adjustments based on the trail conditions, aiming for a balance between comfort and control.

Setting the Air Pressure:

• Purpose: Adjusts the spring rate to match rider weight.
• How to Adjust: Use a shock pump to set the air pressure. Check the manufacturer’s recommended pressure based on your body weight and adjust accordingly. If you are an aggressive rider, you may need to fine-tune the pressure to suit the demands of your riding style.

Fine-Tuning for Performance:

• For Downhill Riders: If you’re tackling more aggressive downhill terrain, set the low-speed compression to a firmer setting to prevent bottoming out while ensuring the rebound is fast enough to handle big hits.
• For Enduro Riders: A more moderate compression setting is ideal for enduro, as you need the shock to absorb a variety of impacts during long runs.

Maintenance of the DHX2 Trunnion Rear Shock

Maintaining your Fox DHX2 Trunnion rear shock ensures long-lasting performance and reliability. Regular maintenance prevents wear and tear and helps retain the shock’s plush feel over time.

Basic Maintenance:

• Clean the shock regularly: After every ride, wipe down the shock with a clean, dry cloth to remove dirt and debris that could potentially damage the seals.
• Check air pressure: Air pressure can drop over time, especially in extreme conditions. Use a shock pump to ensure the pressure is where it should be before each ride.
• Inspect the seals: Over time, seals may degrade. Check the shock for any leaks around the seals and replace them if necessary.

Servicing the Shock:

• Annually: Perform an oil change and service the shock to maintain smooth operation. Fox recommends sending the shock to a certified service center for an annual overhaul, including replacing the oil and cleaning the internal components.

Storage Tips:

• Proper storage: When not in use, store the shock in a cool, dry place. Ensure the shock is not under excessive pressure when stored for long periods.

Troubleshooting Common Set-Up Issues

While the DHX2 Trunnion rear shock is a high-quality piece of equipment, riders may occasionally face issues with setup. Below are common problems and troubleshooting tips:

Problem 1: The shock feels too soft or too hard.

• Solution: Check the air pressure. If the shock feels too soft, increase the air pressure using a shock pump. Conversely, if it feels too stiff, reduce the air pressure. Adjusting compression settings can also help if the air pressure is correct.

Problem 2: The shock is bottoming out.

• Solution: Increase the low-speed compression setting. Additionally, check the air pressure and increase it if necessary to prevent bottoming out during high impacts.

Problem 3: The shock is not returning quickly enough.

• Solution: Slow rebound could be the issue. Adjust the rebound dial to a faster setting (counterclockwise). This should improve the shock’s return speed.

Problem 4: There’s an air leak from the shock.

• Solution: Inspect the seals for damage. If you notice an air leak, the seals may need to be replaced. Fox recommends a full service to replace any worn parts if necessary.

Compatibility with Other Drivetrain Components

The Fox DHX2 Trunnion rear shock is compatible with a variety of drivetrain setups. However, for optimal performance, it’s important to ensure that the shock works harmoniously with other components on the bike, including the frame and fork.

Frame Compatibility:

The DHX2 Trunnion rear shock is designed to fit frames with a trunnion mount. This mount style offers increased bushing overlap, which provides improved frame stiffness and better suspension response. Always check that your bike’s frame supports this specific mounting system before purchase.

Fork Compatibility:

For balanced performance, ensure that your front fork complements the DHX2 shock. Many riders pair this rear shock with a Fox 36 or similar performance-oriented fork to match the shock’s capabilities, providing a well-rounded suspension system for aggressive trail riding.

Comparison with Similar Models

When considering the Fox DHX2 Trunnion rear shock, it’s useful to compare it with other similar models to understand how it stacks up in terms of performance, adjustability, and features.

Fox DHX2 Trunnion vs. Fox X2:

• The DHX2 Trunnion is focused on downhill and enduro riding, with a more robust air spring system and a greater focus on high-speed impacts.
• The X2 is lighter and more oriented towards cross-country and trail riding. It features a more refined damper and is slightly less adjustable than the DHX2 but is better suited for riders seeking a lighter shock for less aggressive riding.

Fox DHX2 Trunnion vs. RockShox Super Deluxe Coil:

• The RockShox Super Deluxe Coil offers coil spring adjustability, which some riders prefer for its consistent feel. However, the DHX2’s air spring and superior compression adjustments make it a more versatile [paid link] shock for varied terrain and aggressive downhill riding.

In summary, the Fox DHX2 Trunnion rear shock is an exceptional choice for riders looking for a high-performance, customizable rear shock with superb adjustability. Proper installation, regular maintenance, and fine-tuning of its settings will ensure that the DHX2 provides optimal performance for years of thrilling rides.