How to Service Your Fenix AIR Rear Shock Without a Mechanic

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The Fenix AIR [paid link] rear shock from Fast Suspension is a high-performance component designed for cyclists who demand precision and reliability. Whether you’re a seasoned rider or someone tackling a DIY project, servicing the Fenix AIR [paid link] rear shock can improve its performance, extend its lifespan, and ensure a smooth ride. This guide will walk you through everything you need to know to maintain and service the Fenix AIR without needing a professional mechanic.

Tools Required

  • Shock pump
  • 5mm and 6mm Allen wrenches [paid link]
  • Torque wrench [paid link]
  • Adjustable spanner
  • Cleaning cloth
  • Suspension fluid (as specified by Fast Suspension)
  • Small syringe or fluid injector
  • O-ring grease
  • Sealant grease (compatible with rear shocks)
  • Isopropyl alcohol (for cleaning)
  • Soft brush or toothbrush
  • Replacement seals and air can spacers (if required)

Disassembly and Inspection of the Fenix AIR Rear Shock

Before diving into maintenance, it’s essential to disassemble the shock properly. This process will allow you to inspect internal components and replace worn parts, ensuring that everything is functioning optimally.

1. Remove the Shock from the Frame

First, remove the Fenix AIR rear shock from your bike frame. Use a 5mm Allen wrench [paid link] to loosen the mounting bolts. Keep track of the washers and other components to ensure they go back in the correct order.

2. Inspect the Shock for External Damage

Carefully examine the shock body, air can, and mounting hardware. Look for any visible signs of wear, dents, or scratches, which can affect performance. If the shock has been exposed to extreme conditions, such as mud or dust, a thorough cleaning should be performed.

3. Remove the Air Canister

Using the appropriate spanner tool, remove the air canister. This will give you access to the shock’s internal components, including the air spring and damper assembly. Ensure that you note the orientation of all parts, as reassembly requires correct alignment.

Cleaning and Lubrication

Proper cleaning and lubrication of the Fenix AIR rear shock are crucial to maintain optimal performance. Contaminants such as dirt, mud, and old lubrication can cause the shock to behave unpredictably or reduce its lifespan.

1. Clean the Shock Body and Air Can

Once the shock is disassembled, clean both the shock body and air can thoroughly. Use isopropyl alcohol and a clean cloth to wipe away any dirt or grime. A small, soft brush can help clean the more delicate areas.

2. Lubricate the Seals and Moving Parts

Apply a small amount of sealant grease to the seals around the shock body and air can. Ensure that the grease is applied evenly but not excessively, as too much grease can attract debris. Lubricating the shock’s moving parts reduces friction and extends the life of the seals.

3. Inspect and Replace O-Rings

O-rings are crucial in preventing air and fluid leaks. Inspect all O-rings for signs of wear, cracking, or deformation. If any O-rings are damaged, replace them before reassembling the shock. Lightly lubricate the new O-rings with a small amount of grease to ensure proper sealing.

Reassembly and Shock Pressure Adjustment

Once your Fenix AIR rear shock is cleaned, lubricated, and inspected, it’s time to reassemble and adjust the shock’s pressure settings.

1. Reassemble the Shock

Carefully reassemble the shock by aligning the air can with the shock body. Secure the air can using the adjustable spanner, making sure that it is tightly fastened without over-torquing. Refer to the manufacturer’s specifications for the exact torque values to avoid damaging the shock.

2. Inflate the Shock

Use a shock pump to inflate the air spring to the recommended pressure. The optimal pressure for your Fenix AIR rear shock will depend on your rider weight, riding style, and preferences. Start with a baseline pressure and fine-tune it for comfort and performance. Remember to check the pressure regularly as it can fluctuate over time.

3. Fine-Tune the Damping Settings

The Fenix AIR rear shock features adjustable rebound and compression damping. Set the rebound to your preferred setting, depending on the type of terrain you ride. For a smoother ride on rough trails, a slower rebound may be preferable, while a faster rebound works well on smoother terrain. Compression can be adjusted based on your riding style and the level of support needed.

Troubleshooting Common Set-Up Issues

Even after performing regular maintenance, there may still be issues that arise with the shock’s performance. Understanding the common set-up issues and how to troubleshoot them can save you time and frustration.

1. Loss of Air Pressure

If you notice a loss of air pressure in your shock, this could be due to a compromised O-ring or a leak in the air canister. Ensure that the seals are properly lubricated and inspect the air can for any cracks. If the issue persists, the shock may require a full rebuild.

2. No Rebound or Inconsistent Damping

If the rebound or compression settings are not working correctly, there could be air in the damper or a need for fresh suspension fluid. A full rebuild may be necessary if the damping mechanism is not responding.

3. Sag or Bottom-Out Issues

If your shock feels like it’s sagging too much or bottoming out too frequently, it could be due to an incorrect air pressure setting or improper damping adjustments. Start by increasing the air pressure and adjusting the compression to prevent excessive travel.

Customization and Optimization

While basic maintenance ensures that the Fenix AIR rear shock operates smoothly, customization can take your riding experience to the next level. Fine-tuning your shock settings can improve performance for your specific riding style and terrain.

1. Air Pressure Adjustments for Rider Weight

One of the key customizations you can make to your Fenix AIR rear shock is adjusting the air pressure based on your body weight. Riders who weigh more may need to increase the air pressure to prevent bottoming out, while lighter riders may prefer a lower pressure for more plush suspension feel.

2. Adjusting Compression and Rebound for Terrain

Compression and rebound settings can be optimized for different types of terrain. For rough, technical trails, increase compression damping to prevent excessive shock movement. On smoother trails, decrease compression for a more responsive feel. Adjust rebound damping to suit your speed and comfort preferences.

Compatibility with Other Drivetrain Components

The Fenix AIR rear shock is designed to integrate seamlessly with a wide range of drivetrain components. However, it’s important to ensure that your shock is compatible with your bike frame and other suspension components for optimal performance.

1. Shock Compatibility with Frame

Before servicing or upgrading your Fenix AIR rear shock, ensure it is compatible with your bike frame. Check the frame’s rear shock mounting system, as some frames require specific shock sizes or shock eyelet configurations.

2. Suspension Linkage and Axle Compatibility

The Fenix AIR rear shock is compatible with most suspension linkages and axles, but it’s important to verify the mounting hardware and shock length. Using the correct shock length and mounting system ensures that the shock performs at its best without causing any strain on the frame.

Conclusion

Servicing and maintaining your Fenix AIR rear shock is a rewarding task that can improve your bike’s performance and extend its lifespan. By following the steps outlined above, you can ensure that your rear shock continues to deliver optimal performance, regardless of the terrain you tackle. Regular cleaning, lubrication, and pressure adjustments are essential, and understanding how to troubleshoot common issues will help you keep your ride smooth and consistent. Whether you’re preparing for a long ride or simply want to ensure your bike is in top condition, proper rear shock maintenance is key to a great riding experience.