The Fox DHX2 Factory rear shock is a high-performance, coil-sprung shock designed for aggressive trail riding, enduro, and downhill mountain biking. It offers superior performance with its custom-tuned damping and fine-tuned coil spring options. To keep your DHX2 shock operating at peak efficiency, regular maintenance and proper setup are essential. In this guide, we’ll cover everything from installation and adjustments to troubleshooting and optimization tips. Whether you’re a seasoned mechanic or a rider looking to learn more about your shock, this guide will provide you with the detailed instructions you need.

Tools Required

• 8mm Allen wrench [paid link]
• 10mm wrench
• Torque wrench [paid link] (up to 25 Nm)
• 5mm Allen wrench [paid link]
• Soft cloth or towel
• Fox suspension fluid (recommended by Fox)
• Shock pump with a high-quality gauge
• Fox damping fluid (appropriate for DHX2)
• Coil spring tension tool
• Replacement seals and bushings (if needed)
• Grease (recommended by Fox)
• Cleaning brush

Installation of the DHX2 Factory Rear Shock

Installing your DHX2 Factory rear shock is a relatively straightforward process but requires careful attention to detail to ensure optimal performance and safety.

Step 1: Remove the Old Shock

1. Begin by removing the rear wheel and any other components that might obstruct access to the rear shock.
2. Use the appropriate Allen wrenches [paid link] to remove the bolts securing the shock to the frame and the linkage.
3. Carefully remove the shock from the bike, keeping an eye on any washers or spacers that may come loose.

Step 2: Prepare the New Shock

1. Clean the shock mounting hardware and inspect it for wear. Replace any worn components such as bushings or bolts if necessary.
2. Apply a small amount of grease to the shock’s mounting bolts, paying attention not to over-grease.
3. Check that the new shock’s dimensions and mounting hardware match your bike’s frame specifications.

Step 3: Install the New Shock

1. Position the shock into the mounting location, ensuring that it is aligned correctly with the frame.
2. Secure the shock to the frame using the mounting bolts, tightening them to the manufacturer’s recommended torque settings (typically around 25 Nm for the bolts).
3. Double-check the shock’s positioning to make sure it is centered and straight.

Step 4: Reinstall the Wheel and Other Components

Once the shock is installed, reassemble the rest of the bike, ensuring all components are secure before proceeding to the next steps.

Adjusting Your DHX2 Factory Rear Shock

The DHX2 Factory rear shock offers precise adjustments for both rebound and compression damping, as well as spring preload, to match your riding style and terrain.

Rebound Adjustment

1. Rebound controls how quickly the shock returns after compression. Turn the rebound dial located at the bottom of the shock.
2. Clockwise will slow the rebound, and counterclockwise will speed it up.
3. For most riders, a mid-range setting is recommended, but fine-tuning may be necessary based on terrain and personal preference.

Compression Adjustment

1. The compression dial allows you to control how the shock compresses under load.
2. The DHX2 has high-speed and low-speed compression adjustments, located near the shock’s reservoir.
3. High-speed compression adjusts the shock’s behavior during large impacts, while low-speed compression controls the shock’s response to smaller, slower forces.
4. Adjust the dials to suit your riding style. A stiffer setting helps with aggressive riding, while a softer setting is better for smooth, flowing trails.

Spring Preload Adjustment

1. The DHX2 features a coil spring, and the preload adjustment determines how much tension is placed on the spring.
2. Use a coil spring tension tool to adjust the preload, ensuring that the shock has the correct sag for your weight and riding style.
3. For accurate sag measurement, use a shock pump to set the appropriate air pressure.

Maintenance of the DHX2 Factory Rear Shock

Regular maintenance will ensure that your DHX2 rear shock remains responsive and durable over time. Here’s how to maintain it:

Cleaning

1. After each ride, use a soft cloth or towel to wipe down the shock and remove any dirt or debris.
2. For a deeper clean, use a brush to gently remove grime from the shock’s body and seals.
3. Avoid using harsh chemicals that may degrade the seals.

Lubrication

1. Over time, the shock’s internal components may wear out and require lubrication. Refer to the Fox maintenance manual for the recommended suspension fluid type.
2. Periodically apply the recommended suspension fluid to the shock’s internal parts to ensure smooth operation and prevent rust.

Seals and Bushings

1. Inspect the seals and bushings regularly for wear. If you notice any oil leaks or degraded seals, it’s time to replace them.
2. To replace the seals, carefully remove the shock’s air can and inspect the internal parts. Replace any worn components and reassemble the shock.

Spring and Damping Fluid

1. Depending on your riding conditions, it’s essential to change the shock’s damping fluid every 50-100 hours of riding.
2. To replace the fluid, disassemble the shock according to Fox’s guidelines, drain the old fluid, and refill it with fresh damping fluid.

Troubleshooting Common Issues

While the DHX2 Factory rear shock is a durable and reliable component, you may encounter issues from time to time. Here are some common problems and their solutions:

Excessive Rebound Speed

1. If your shock returns too quickly, it may be due to incorrect rebound adjustment. Turn the rebound dial clockwise to slow the rebound.
2. Check that the spring rate is correctly set for your weight, as a too-soft spring may also contribute to excessive rebound.

Sag and Bottoming Out

1. If the shock bottoms out frequently, you may need to increase the preload on the spring or consider a stiffer spring option.
2. Check the air pressure to ensure the correct sag is set, which should typically be around 25-30% of the shock’s total travel.

Oil Leaks

1. Oil leaks around the seals can occur with frequent use or improper maintenance. Check and replace the seals as needed.
2. If the issue persists, the shock may need to be fully serviced or rebuilt by a professional.

Customization and Optimization for Better Performance

To achieve optimal performance, consider customizing your DHX2 rear shock to match your specific riding style and terrain.

Fine-Tuning for Aggressive Riding

1. For downhill or aggressive trail riding, increase the high-speed compression damping and increase preload on the spring to reduce sag.
2. Decrease rebound damping to prevent the shock from feeling too stiff or unresponsive.

Fine-Tuning for Enduro or Cross-Country Riding

1. For enduro or cross-country riding, use a softer compression setting to allow the shock to absorb smaller bumps while maintaining control during high-speed sections.
2. Opt for a lower preload setting to allow the shock to have more sensitivity and plushness over rough terrain.

Compatibility with Other Drivetrain Components

The DHX2 Factory rear shock is designed to be compatible with a wide range of mountain bike frames and drivetrain systems. However, compatibility may depend on factors such as shock mount sizes and geometry.

Checking Frame Compatibility

1. Before installing the DHX2 rear shock, ensure that the shock’s mounting hardware matches the frame’s shock mounts.
2. Verify that the shock’s travel length is suitable for the frame, as some frames may only support a specific range of shock travel.

Integration with Suspension Forks

The DHX2 rear shock works well with both air and coil suspension forks, provided the shock’s travel and compression settings complement those of the front fork.