DIY Maintenance Guide for Your Fenix AIR Rear Shock

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The Fenix AIR [paid link] Rear Shock from Fast Suspension is a high-performance suspension component designed for serious cyclists. Whether you’re tackling tough terrain or enjoying a smooth ride, this shock is engineered to deliver top-tier performance. Proper maintenance, installation, and adjustment are crucial to ensure it operates at its best. This guide will walk you through essential tasks, from installation to troubleshooting, to help you keep your Fenix AIR [paid link] Rear Shock in optimal condition.

Installation of the Fenix AIR Rear Shock

Before installing the Fenix AIR Rear Shock, ensure that you have the necessary tools and components for the job. Proper installation is key to preventing damage to the shock or the frame.

Tools Required

  • 5mm and 6mm Allen wrenches [paid link]
  • Torque wrench [paid link]
  • Shock pump
  • 8mm and 10mm open-end wrenches
  • Soft cloth or towel
  • Grease (for hardware)

Installation Steps

  1. Remove the Old Shock (if applicable):
    • Begin by removing the rear wheel and any necessary components blocking access to the shock.
    • Use the appropriate Allen wrenches [paid link] to remove the bolts securing the existing shock. Keep the hardware safe for reuse or replacement if necessary.
  2. Prepare the Fenix AIR Shock:
    • Check the shock’s eyelets and hardware. Ensure that everything is clean and free of debris. Apply a light coat of grease to the hardware to prevent corrosion.
    • Verify the shock’s specifications, including the eyelet size and stroke length, to ensure compatibility with your bike frame.
  3. Install the Shock:
    • Align the shock’s mounting eyelets with the mounting points on your frame.
    • Secure the upper and lower bolts, tightening each with the correct torque (consult the manufacturer’s specifications for the recommended torque values).
    • Be sure to avoid over-tightening, which can damage the shock or the frame.
  4. Check for Alignment:
    • Once installed, double-check the alignment of the shock to ensure it sits properly in the frame. If misaligned, re-adjust and retighten the bolts.
  5. Set the Sag:
    • Using a shock pump, adjust the air pressure according to your weight and riding style. Consult the user manual for recommended pressures.
    • Recheck the sag by sitting on the bike and compressing the shock. Adjust until the sag is within the recommended range.
  6. Final Checks:
    • Once the shock is installed, inspect the bike for any movement or rattling. Ensure that everything is secure and functioning correctly before taking the bike for a test ride.

Adjustment and Tuning for Optimal Performance

The Fenix AIR Rear Shock is designed for maximum adjustability, allowing you to fine-tune the suspension settings to your specific riding conditions and preferences. Proper adjustment will help improve comfort and control during your rides.

Air Pressure Adjustments

The Fenix AIR shock uses air pressure to control the compression and rebound. The shock pump is a vital tool for adjusting air pressure based on rider weight and preferences.

  1. Preload (Sag) Setting:
    • Ensure that the shock is set to the correct sag based on your weight. The recommended sag range is typically between 25-30% of the shock’s total travel. This helps achieve the proper balance between comfort and control.
  2. Compression Damping:
    • Adjust the compression damping to control how the shock reacts to bumps and impacts. This can be adjusted to a softer or firmer setting depending on the terrain you are riding on. For technical trails, a firmer setting may offer better control, while a softer setting provides comfort on smoother surfaces.
  3. Rebound Damping:
    • The rebound adjustment controls how quickly the shock returns to its original position after compression. Set the rebound damping to ensure the shock doesn’t extend too quickly, which could lead to instability, or too slowly, which could lead to a “sticking” sensation. Fine-tune for optimal control.
  4. Fine-tuning for Conditions:
    • Adjust the shock settings based on the type of terrain you’ll be riding. For rough trails, increase the compression to handle larger impacts. For smoother conditions, reduce the compression for a more plush ride.

Maintenance of the Fenix AIR Rear Shock

Regular maintenance is essential for ensuring the longevity and performance of your Fenix AIR Rear Shock. Proper care will prevent wear and tear, keeping your suspension smooth and responsive.

Routine Maintenance Tasks

  1. Clean the Shock:
    • Regularly clean the shock to remove dirt, mud, and debris that may accumulate during your rides. Use a soft cloth or towel to wipe down the shock. Avoid harsh chemicals that could damage the shock’s finish.
  2. Inspect the Bushings and Bearings:
    • Check the bushings and bearings at the shock’s eyelets for signs of wear. If they become loose or worn, they should be replaced to avoid damage to the shock and frame.
  3. Check for Leaks:
    • Inspect the shock for any signs of oil or air leakage. If you notice any leaking, it may indicate a seal issue, which will require a service.
  4. Lubricate the Mounting Points:
    • Apply a small amount of grease to the mounting hardware and bushings. This will reduce friction and prevent the components from seizing up over time.
  5. Inspect Air Can:
    • Periodically check the air can for any signs of damage or wear. If the air can becomes damaged, it may affect the shock’s ability to maintain pressure.

When to Perform a Full Service

A full service is recommended every 50-100 hours of riding, or sooner if you notice performance issues like poor rebound, sag, or leaking air. During a full service, the shock is disassembled, cleaned, and re-lubricated to ensure it continues to function at its best.

Troubleshooting Common Issues

If you encounter problems with your Fenix AIR Rear Shock, troubleshooting can help resolve the issue. Below are some common problems and solutions:

Lack of Rebound or Slow Rebound

  • Cause: The rebound damping is set too slow, or there is a blockage in the shock.
  • Solution: Adjust the rebound setting to a faster setting and check for any debris that may be affecting the shock’s performance.

No Compression or Too Much Compression

  • Cause: Incorrect air pressure or a damaged shock.
  • Solution: Check and adjust the air pressure. If the shock still feels unresponsive, inspect for leaks or consider a full service.

Air Leaks

  • Cause: Damaged seals or faulty valves.
  • Solution: Inspect the seals and valves for damage. If necessary, replace the seals or take the shock to a professional for a rebuild.

Customization for Better Performance

To get the most out of your Fenix AIR Rear Shock, you can customize it to suit your riding style and preferences. Some customizations you may consider include:

  1. Tuning Damping Settings:
    • Adjust the compression and rebound settings to match the terrain and riding conditions you encounter most often.
  2. Change Air Pressure for Different Conditions:
    • On particularly technical rides, increasing the air pressure slightly will help firm up the suspension for better control. On smoother rides, reduce the pressure for a plush feel.
  3. Upgrade Mounting Hardware:
    • Consider upgrading the mounting hardware to high-quality, durable components for improved performance and longevity.

Compatibility with Other Drivetrain Components

The Fenix AIR Rear Shock is designed to be compatible with a wide range of bike frames and drivetrain systems. However, when upgrading or customizing your bike, it’s essential to check the compatibility of the shock with other components, such as the rear triangle and linkage. Ensure that the shock’s dimensions, mounting eyelet sizes, and stroke length are suitable for your frame.

While the Fenix AIR Rear Shock is highly versatile [paid link], it is best to consult the frame manufacturer’s guidelines or a professional mechanic to confirm compatibility with your bike’s specific setup.

Conclusion

The Fenix AIR Rear Shock from Fast Suspension is a high-quality, adjustable component that can enhance your bike’s performance across a range of terrains. By following this maintenance guide, you’ll ensure your shock performs at its best, providing you with a smooth and controlled ride. Regular adjustments, proper maintenance, and timely troubleshooting will extend the lifespan of your shock and help you get the most out of your cycling experience.