How to Service Your Fenix COIL Rear Shock Without a Mechanic

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Servicing your Fenix COIL [paid link] Rear Shock can be a rewarding task for any cyclist who wants to maintain their bike’s performance without relying on a professional mechanic. With the right tools, knowledge, and patience, you can handle basic maintenance and repairs, ensuring your shock continues to perform at its best for years.

Tools Required

Before you start, gather the following tools:

  • Torque wrench [paid link]
  • Allen wrenches [paid link] (specifically 4mm, 5mm, and 6mm)
  • Shock pump
  • Needle-nose pliers
  • 10mm socket wrench
  • A clean rag or towel
  • Threadlocker
  • Suspension fluid (Fenix COIL [paid link] recommended brand)
  • Syringe for suspension fluid (optional)
  • Small container for parts and oil

Step 1: Remove the Rear Shock from the Bike

Before you can service the Fenix COIL Rear Shock, it needs to be safely removed from the bike. Here’s how to do it:

  1. Position the bike: Place the bike in a stable position, either on a work stand or leaning against a surface where it won’t move during the removal.
  2. Loosen the mounting bolts: Use the correct Allen wrench [paid link] to remove the bolts securing the rear shock to the frame. Keep the bolts in a small container to prevent losing them.
  3. Remove the shock: Once the bolts are removed, gently pull the shock out of its mount. Ensure that no cables or other parts are caught in the process.

Step 2: Clean the Rear Shock

Before disassembling your rear shock, it’s important to clean it thoroughly to avoid contaminants entering the internal components.

  1. Use a clean rag: Wipe down the entire shock, paying special attention to the eyelets and the seals where dirt and debris often accumulate.
  2. Inspect for damage: Check for any obvious signs of wear, such as oil leakage, torn seals, or scratches. If you notice damage, it may be time to replace the shock or certain components.

Step 3: Disassemble the Shock

Now, it’s time to begin the disassembly process. This step will allow you to inspect the internal components and refresh the suspension fluid.

  1. Remove the shock body cap: Use the 10mm socket wrench to loosen the shock body cap. Carefully remove it, making sure not to damage the threads.
  2. Release the air pressure: Using the shock pump, release any remaining air pressure inside the shock. This is crucial to prevent accidents during disassembly.
  3. Take out the internal components: Use the needle-nose pliers to carefully remove the internal components, including the spring and damping mechanism. Take note of how each component is assembled to ensure proper reassembly.

Step 4: Inspect and Clean Internal Parts

Once the shock is disassembled, it’s important to inspect and clean each part before reassembling. This ensures that no dirt or debris is left inside that could interfere with the shock’s performance.

  1. Inspect the spring: Check for any signs of wear or damage on the coil spring. If the spring is worn or damaged, it will need to be replaced.
  2. Examine the damping system: Look for any visible issues with the damper, such as leaking fluid or damaged seals. If needed, replace the damping assembly.
  3. Clean the components: Use a clean rag to wipe down all the internal components. Be sure to remove any old suspension fluid and grime from the parts.

Step 5: Refill with Suspension Fluid

After cleaning the internal components, it’s time to refill the shock with fresh suspension fluid.

  1. Prepare the suspension fluid: Use the recommended fluid for the Fenix COIL shock. If you’re unsure, check the user manual for specifications.
  2. Fill the shock body: Using a syringe or a small funnel, carefully pour the suspension fluid into the shock body. Make sure not to overfill it.
  3. Reassemble the shock: Once the fluid is inside, carefully place all the internal components back into the shock body. Make sure everything is properly aligned, and reattach the body cap using the torque wrench [paid link] to tighten it according to the manufacturer’s recommended torque settings.

Step 6: Reinstall the Shock

Now that the shock is fully serviced, it’s time to reinstall it on the bike.

  1. Position the shock: Place the shock back into its mount on the bike frame.
  2. Secure the mounting bolts: Use the correct Allen wrenches [paid link] to tighten the mounting bolts. Be sure to torque the bolts to the manufacturer’s recommended specifications.
  3. Reinflate the shock: Use the shock pump to reinflate the shock to the desired pressure. Check the bike’s user manual for the recommended pressure settings for your weight and riding style.

Step 7: Perform a Test Ride

Once the shock is reinstalled and properly inflated, it’s important to test it to ensure everything is functioning correctly.

  1. Check for proper damping: Perform a few compressions on the shock while checking for smooth movement. There should be no stiction or irregular resistance.
  2. Listen for any unusual noises: During the test ride, listen for any odd sounds, such as squeaks or grinding, which could indicate a problem with the shock.
  3. Monitor performance: Pay attention to how the shock feels during the ride. If the suspension feels too soft, too firm, or unresponsive, you may need to adjust the pressure or check for internal damage.

Troubleshooting Common Set-Up Issues

Even with careful maintenance, issues may still arise. Here are a few common problems you may encounter with the Fenix COIL Rear Shock and how to troubleshoot them:

  1. Shock not holding air: If the shock loses air pressure quickly, it could indicate a seal or valve issue. Check the seals for damage and replace any worn seals. If the valve is faulty, it may need to be replaced.
  2. Excessive sag: If the shock sags too much, it could be a sign that the pressure is too low. Increase the air pressure using the shock pump to achieve the correct sag.
  3. No rebound control: If the shock doesn’t return smoothly, check the damper for issues. It may need to be serviced or replaced if the damping fluid has degraded or if there’s internal damage.

Customizing and Optimizing Performance

To get the most out of your Fenix COIL Rear Shock, consider the following adjustments and customizations:

  1. Adjusting sag: The correct sag ensures the shock performs optimally. Adjust the air pressure to achieve 25-30% sag, based on your weight and riding style.
  2. Fine-tuning rebound: Adjust the rebound damping knob to control how quickly the shock returns after compression. For smoother terrain, set the rebound slower; for more technical terrain, a faster rebound might be necessary.
  3. Spring rate customization: If you find the shock too soft or too stiff, consider replacing the coil spring with one that matches your weight and riding style for optimal performance.

Comparison with Similar Models

When comparing the Fenix COIL Rear Shock to other models, there are several factors to consider:

  1. Price: The Fenix COIL offers a solid balance between performance and affordability. While there are more expensive options on the market, the Fenix COIL provides good value for riders looking for reliable performance without breaking the bank.
  2. Performance: The Fenix COIL excels in offering consistent performance, especially on rough terrain. Some other models may offer more advanced features like electronic damping control or lighter weight, but for its price, the Fenix COIL performs well in most conditions.
  3. Maintenance: The Fenix COIL is relatively easy to service compared to higher-end models, which often require specialized tools and knowledge. Riders looking for an easier-to-maintain shock will appreciate the Fenix COIL’s straightforward design.

Compatibility with Other Drivetrain Components

The Fenix COIL Rear Shock is designed to work seamlessly with a wide range of drivetrain components. However, to ensure optimal performance, here are a few considerations:

  1. Frame compatibility: Ensure that your bike frame is designed to accommodate a coil shock. Some frames are optimized for air shocks, which may not provide the same level of durability as a coil shock.
  2. Spring rate compatibility: Check that the coil spring is the correct rate for your weight and riding style. If the spring is too soft or too stiff, it can negatively impact your riding experience.
  3. Suspension tuning: If you’re using a high-performance drivetrain, consider tuning your suspension to match your riding style. This will help ensure that your shock works in harmony with your bike’s other components.

By following these guidelines, you can maintain and service your Fenix COIL Rear Shock effectively, keeping it in top condition for your rides.