The Fenix AIR [paid link] rear shock by Fast Suspension is a cutting-edge component designed for superior performance in road and mountain bike suspension systems. Known for its lightweight design, high performance, and customizable settings, the Fenix AIR [paid link] offers cyclists exceptional ride quality and control. This guide will cover everything you need to know about the Fenix AIR rear shock, including installation, adjustment, maintenance, troubleshooting, and optimization for better performance.
Tools Required
- 5mm Allen wrench [paid link]
- Torque wrench [paid link]
- Shock pump
- 2mm Allen wrench [paid link]
- Soft cloth or rag
- Suspension grease
- Latex gloves
- Measuring tape
- Dropper seatpost tool (optional)
Installation of the Fenix AIR Rear Shock
Step 1: Prepare the Bike Frame
Before installing the Fenix AIR rear shock, ensure your bike frame is clean and free of dirt. Remove any old suspension components if you’re replacing an existing shock.
Step 2: Attach the Shock to the Frame
Using a 5mm Allen wrench, carefully install the shock into the bike’s rear triangle. The Fenix AIR comes with a standardized eyelet fitting, which should align easily with the frame’s shock mounting points. Ensure that the shock’s eyelets are correctly positioned and that the shock is fully seated into place.
Step 3: Secure the Shock with Bolts
Once the shock is in position, insert the provided mounting bolts through the eyelets. Tighten them with your 5mm Allen wrench, applying the manufacturer’s recommended torque settings. It is important to use a torque wrench [paid link] for precise tightening to avoid damaging the shock or the frame.
Step 4: Install the Shock Pump
Connect the shock pump to the valve located at the rear of the shock. Ensure the connection is secure to avoid air leaks. Make sure that the pump’s pressure gauge is calibrated and ready for use.
Step 5: Set Initial Air Pressure
Using the shock pump, inflate the shock to the recommended pressure based on your weight, riding style, and suspension needs. The Fenix AIR rear shock features an air-spring system, and proper air pressure is crucial for achieving optimal performance. Refer to the user manual for the recommended air pressure range for your specific rider profile.
Adjusting the Fenix AIR Rear Shock
Rebound Adjustment
The Fenix AIR rear shock comes equipped with an adjustable rebound control knob. To adjust the rebound:
- Locate the rebound dial at the bottom of the shock.
- Turn the knob clockwise to slow down the rebound or counterclockwise to speed it up.
- Begin with a mid-range setting, then fine-tune based on your riding preferences. Slower rebound is ideal for absorbing larger impacts, while faster rebound is suited for more responsive handling on rough trails.
Compression Adjustment
The compression dial allows you to adjust the shock’s resistance to compression, which affects how the shock absorbs bumps and impacts.
- The Fenix AIR shock features both low-speed and high-speed compression adjustments.
- For low-speed compression, adjust the dial to control the shock’s response to small, slow impacts.
- The high-speed compression dial adjusts the shock’s performance under rapid, high-impact forces, such as when hitting large obstacles.
- Fine-tune each setting to match the terrain you plan to ride on. If you ride on technical trails, higher compression settings may be ideal, while smoother roads may benefit from a softer setup.
Air Pressure Fine-Tuning
The air pressure in the shock directly impacts the ride’s comfort and responsiveness. Fine-tune the pressure for different types of riding by using the shock pump.
- Start with the manufacturer’s recommended air pressure.
- If you are riding rough terrain or require additional support, consider increasing the pressure slightly.
- Conversely, for more comfort and softer suspension, lower the air pressure incrementally.
- Remember to check the air pressure periodically, especially after rides or significant temperature changes.
Maintenance of the Fenix AIR Rear Shock
Regular Cleaning
To ensure your Fenix AIR rear shock operates efficiently, clean it regularly. After each ride, wipe down the shock with a soft cloth or rag to remove dirt and debris. This helps prevent dirt buildup in the shock’s seals, which could compromise performance.
Lubrication of the Shock Seals
Proper lubrication of the shock seals ensures smooth travel and prevents premature wear. Every 10 to 15 hours of riding, apply a light coat of suspension grease to the shock’s seals to maintain their performance. Be cautious not to over-apply the grease, as excess grease can attract dirt.
Replacing the Air Canister O-Rings
The O-rings in the air canister should be inspected and replaced every 100-150 hours of riding. Damaged or worn O-rings can lead to air leaks and reduced performance.
Check for Leaks
Periodically inspect the shock for any signs of oil or air leaks. If you notice a drop in air pressure over time or see oil around the seals, it may be time for a rebuild or seal replacement.
Troubleshooting Common Issues with the Fenix AIR Rear Shock
Issue 1: Air Loss in the Shock
Air loss in the shock can be caused by worn-out seals or a defective valve. Inspect the shock for visible damage or leaks. If air pressure is consistently low despite proper inflation, check the valve and O-rings for wear and replace them as necessary.
Issue 2: Shock Not Rebounding Properly
If the shock is not rebounding properly, check the rebound adjustment dial to ensure it is set correctly. If the rebound is set too slow, the shock may not return to its original position after compression. Adjust the rebound settings to your preference and check for any internal damage if the issue persists.
Issue 3: Overly Stiff or Soft Suspension
If the shock feels too stiff or too soft, it may be due to improper air pressure or compression settings. Begin by adjusting the air pressure based on your weight and the type of riding you do. Additionally, check the compression settings for optimal performance, as too high or too low of a setting can lead to discomfort.
Customization and Optimization for Better Performance
Tune for Your Riding Style
The Fenix AIR rear shock is highly customizable, which allows riders to optimize their setup based on personal preferences and riding style. Whether you’re a cross-country racer, trail enthusiast, or endurance rider, the ability to adjust compression and rebound settings means you can dial in the shock for your exact needs.
Use the Right Air Pressure
As discussed earlier, adjusting the air pressure is critical for achieving the desired suspension feel. Lighter riders should reduce the pressure to achieve a softer, more plush ride, while heavier riders may need to increase the pressure for better support.
Experiment with Compression Settings
Experiment with both low-speed and high-speed compression settings to find the optimal balance for the terrain you ride most. A firmer compression setting provides greater control on steep or technical trails, while a softer setting can improve comfort on smoother rides.
Comparing Fenix AIR Rear Shock with Other Models
When comparing the Fenix AIR to other high-performance rear shocks, it stands out for its balance between lightweight design and versatility. Unlike some other models that may prioritize either weight savings or adjustability, the Fenix AIR offers both, making it an excellent choice for riders who want an all-around performer. Compared to more budget-friendly options, the Fenix AIR provides superior responsiveness and longer durability, especially when used on rougher terrain.
Compatibility with Other Drivetrain Components
The Fenix AIR rear shock is designed to work seamlessly with a variety of modern bike frames and drivetrain components. It is compatible with most 27.5” and 29” wheels and works well with both hardtail and full-suspension bikes. When upgrading or replacing a rear shock, it is essential to ensure that the shock’s eyelet dimensions match the mounting points on your frame. Compatibility with other suspension components, such as forks and seatposts, should also be considered to maintain consistent suspension performance across your bike.