The Fox DHX Factory [paid link] rear shock is a high-performance, coil-sprung shock designed for aggressive mountain biking, providing excellent control and comfort on rough terrain. To ensure the longevity and optimal performance of your DHX Factory [paid link] rear shock, regular preventative maintenance is crucial. This guide covers all necessary steps for maintaining your DHX Factory shock, troubleshooting common issues, and optimizing its performance for a smoother ride.

Tools Required

• 5mm Allen wrench [paid link]
• Torque wrench [paid link]
• Shock pump
• 10mm spanner
• Fox Float Fluid or equivalent
• Suspension grease
• Cleaning rags
• Suspension seal kit (if servicing internals)

Inspection and Cleaning

Regular Visual Inspection

Start by inspecting your DHX Factory rear shock for any visible signs of damage or wear. Look for:

• Oil leaks around the shock body or air sleeve.
• Excessive wear on seals or mounting hardware.
• Any cracks or dents in the shock body.
• Bent or worn-out springs.

A thorough inspection will help you catch potential issues early and prevent more severe damage.

Cleaning the Shock

Regular cleaning is essential to maintain performance and longevity. Use a soft rag and water to wipe off any dirt and grime. Avoid using harsh chemicals or solvents that could degrade the shock seals. After cleaning, ensure the shock is fully dried before applying lubrication or reassembling.

Lubricating Mounting Points

Apply a small amount of suspension grease to the shock’s mounting hardware, including the eyelets and bolts. This will prevent corrosion and facilitate smooth movement during compression and rebound cycles. Make sure the grease used is compatible with suspension components.

Rebuilding and Servicing

Rebuilding the Shock

Over time, internal seals can degrade due to exposure to dirt, water, and heat. Regularly servicing your DHX Factory shock will ensure it maintains peak [paid link] performance. You should rebuild the shock every 50-100 hours of riding or annually, depending on usage.

Follow these steps to rebuild:

1. Remove the Shock: Begin by removing the shock from the bike frame using a 5mm Allen wrench [paid link] to remove the mounting bolts.
2. Disassemble the Shock: Use the 10mm spanner to unscrew the spring retainer. Carefully remove the coil spring from the shock body.
3. Drain Old Fluid: Place a container under the shock to catch any oil when you unscrew the air sleeve. Drain out the old oil completely.
4. Clean and Inspect Internals: After draining, clean the shock components with a clean rag. Inspect the seals and internal components for wear. If seals are damaged, replace them with a new seal kit.
5. Reassemble with Fresh Oil: Once all components are cleaned and inspected, reassemble the shock using fresh oil (Fox Float Fluid or equivalent) and ensure all internal parts are lubricated before sealing them back together.

Spring Replacement and Tuning

Coil springs wear out over time, particularly if the shock is used frequently. If you notice any decrease in performance or an uneven rebound, it may be time to replace the coil spring. To replace the spring, simply remove it as mentioned in the rebuilding steps, then install a new spring of the appropriate stiffness for your weight and riding style.

Shock Pressure Adjustment

Correct Air Pressure for Optimal Performance

For the DHX Factory rear shock to function optimally, setting the correct air pressure is essential. Incorrect pressure can lead to poor performance, excessive sag, or a harsh ride.

1. Check Manufacturer Recommendations: Always refer to the Fox recommended air pressure for your specific weight and riding style. Typically, this will be printed on the shock or available on Fox’s website.
2. Use a Shock Pump: Attach the shock pump to the air valve and slowly adjust the pressure according to your requirements. Remember, pressure should be checked when the shock is fully extended, with no rider weight applied.
3. Check Sag: Ensure the shock’s sag (the amount the shock compresses under the rider’s weight) is within the recommended range. If the sag is too high or too low, adjust the pressure accordingly.

Troubleshooting Common Issues

Lack of Rebound Control

If the rebound control on your DHX Factory rear shock is lacking, it could indicate a problem with the internal damping or low oil levels. To troubleshoot:

• Check oil levels and top up if necessary.
• Inspect the rebound adjustment knob for any issues such as dirt or damage.
• If the rebound control is still poor after addressing these factors, consider performing a full shock rebuild.

Soft or Bouncy Ride

A soft or bouncy ride can be caused by several factors, including incorrect spring tension, low air pressure, or faulty damping. Start by checking the air pressure and ensuring the correct spring rate is installed for your weight. If the issue persists, inspect the internal components of the shock for wear or damage.

Leaking Oil

Oil leaks usually occur around the seals, which may need to be replaced. If you notice oil leaking from the shock, carefully inspect the seals for damage. If they are worn out, replacing them is the only way to prevent further oil loss and maintain proper shock performance.

Customization and Optimization for Better Performance

Tuning for Specific Riding Conditions

The DHX Factory rear shock is highly tunable, allowing you to adjust compression and rebound to suit different riding conditions. Consider these customizations based on your riding style:

• For Aggressive Downhill: Set the compression to a firmer setting to reduce bottoming out and improve control on steep descents.
• For Cross-Country or Enduro: Use a more plush setting with lower compression to absorb smaller bumps and maintain traction.
• Rebound Tuning: Adjust the rebound to control how quickly the shock returns after compression. A slower rebound setting is ideal for downhill, while a faster setting works better for cross-country riding.

Fine-tuning Compression

The DHX Factory offers both high and low-speed compression adjustment. Fine-tuning the compression allows you to balance comfort and control for different trail types. Lower the compression for a softer, more forgiving ride on rough terrain, or increase it for better handling and control on smoother trails.

Compatibility with Other Drivetrain Components

Ensuring Compatibility

The DHX Factory rear shock is designed to work seamlessly with a wide range of bike frames and drivetrain components, including most 12-speed and 11-speed drivetrains. However, it is essential to verify compatibility with your bike frame’s shock mount dimensions before purchasing.

Choosing the Right Suspension for Your Frame

Each bike frame is designed with specific shock mount measurements, which determine the stroke length and overall shock size compatibility. Be sure to choose the right size shock that matches your frame’s specifications to achieve the best performance.