The Fenix AIR [paid link] rear shock by Fast Suspension is a high-performance component designed to provide exceptional handling and comfort for riders on demanding terrain. This shock excels in terms of innovation, adjustability, and durability, offering a superior riding experience. This guide will cover the installation, adjustment, maintenance, troubleshooting, and optimization of the Fenix AIR [paid link] rear shock, along with a comparison to similar models.
Installation of the Fenix A
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IR Rear Shock
Tools Required:
- 8mm Allen wrench [paid link]
- Torque wrench [paid link]
- Shock pump
- Grease
- Measuring calipers
Step-by-Step Installation:
- Prepare the Bike Frame: Before installing the shock, make sure the rear suspension linkage is clean and free from any debris or grease. This ensures proper mounting and smooth functionality of the shock.
- Install the Shock Mounting Hardware: Place the shock’s mounting hardware through the eyelets of the shock and position it correctly within the bike’s rear triangle.
- Secure the Shock: Using an 8mm Allen wrench [paid link], tighten the bolts securing the shock to the frame. Ensure that the torque specifications are followed (usually between 10-15 Nm). Always check the manufacturer’s specifications for your specific frame.
- Set the Sag: Using a shock pump, inflate the Fenix AIR rear shock to the recommended air pressure, based on the rider’s weight and preferred sag percentage (typically around 30% of the shock’s total travel). This will ensure the shock is ready for use.
- Final Check: Double-check all mounting bolts and ensure the shock is seated properly within the frame. Verify that the suspension linkage is functioning without obstruction.
Adjustment and Tuning of the Fenix AIR Rear Shock
The Fenix AIR offers a range of adjustments that allow you to fine-tune the shock’s performance for various riding styles and terrain.
Rebound Adjustment:
- The rebound adjustment dial is located at the bottom of the shock. It controls how quickly the shock returns to its original position after compression.
- Turn the dial clockwise to slow down the rebound, or counterclockwise to speed it up. Adjust based on terrain type: faster rebound for smoother trails, slower rebound for technical or rough terrain.
Compression Adjustment:
- The Fenix AIR features high and low-speed compression adjustments. High-speed compression controls the shock’s response to larger impacts, while low-speed compression handles smaller bumps and trail chatter.
- The compression adjuster is usually located near the top of the shock. Use it to increase the firmness for more aggressive riding or to dial it back for a smoother ride.
Air Pressure:
- Air pressure is crucial for adjusting the sag and overall feel of the shock. It directly impacts how the shock performs under load.
- Use a shock pump to adjust the air pressure based on your weight and riding style. This will help to achieve the ideal sag percentage for efficient energy transfer and comfort.
Bottom-Out Protection:
- The Fenix AIR has an integrated bottom-out bumper that prevents excessive compression. You can adjust the compression settings to allow for more or less bottom-out protection depending on your needs.
Maintenance of the Fenix AIR Rear Shock
Regular maintenance is vital for ensuring the longevity and performance of your Fenix AIR rear shock. Here are key maintenance practices to follow:
Cleaning:
- After every ride, especially in muddy or dusty conditions, clean the shock with a soft cloth. Use water and mild soap to remove dirt and debris from the shock body and linkage.
Lubrication:
- Periodically, remove the shock from the frame and apply light grease to the mounting bolts and the shock’s eyelet bearings. This ensures smooth movement and prevents creaking noises.
Seal Maintenance:
- The shock’s seals should be inspected regularly for wear. If the seals show signs of damage or excessive oil leakage, they should be replaced. Fast Suspension recommends having the seals replaced every 100 hours of riding to ensure optimal performance.
Shock Servicing:
- Fast Suspension advises having the Fenix AIR serviced at regular intervals, usually once per year, or after 150 hours of use. This involves checking internal components like the damper and air spring for wear and replacing fluid as needed.
Troubleshooting Common Set-Up Issues with the Fenix AIR Rear Shock
Problem 1: Uncomfortable Ride or Insufficient Sag
- Possible Cause: Incorrect air pressure or rebound settings.
- Solution: Double-check the air pressure based on your weight and ensure that the rebound is adjusted to your preferred comfort level. If the sag feels too stiff or too soft, adjust the air pressure accordingly.
Problem 2: Noisy Shock
- Possible Cause: Dry or worn-out seals, or insufficient lubrication.
- Solution: Clean the shock and lubricate the mounting points. Check the seals for wear and replace them if necessary.
Problem 3: Reduced Performance or Lack of Sensitivity
- Possible Cause: Air pressure is too low, or the shock requires a service.
- Solution: Check the air pressure and adjust it based on your riding preferences. If the issue persists, consider sending the shock in for a full service to address internal damping issues.
Customization and Optimization for Better Performance
The Fenix AIR rear shock is highly customizable, making it suitable for a variety of riders, from casual trail riders to competitive racers. Here are some ways to optimize its performance:
Tailor the Settings to Your Riding Style:
- If you primarily ride on rough, technical trails, increase the high-speed compression damping to help absorb larger hits. Conversely, for smoother trails, you can reduce compression damping for a more plush feel.
Experiment with Air Pressure:
- Rider weight plays a significant role in the shock’s performance. Make sure to regularly adjust the air pressure based on changes in body weight, riding style, or the terrain conditions. Keep a log of the settings that work best for specific trails to make it easier to adjust in the future.
Fine-Tune the Rebound:
- Depending on your riding style, adjust the rebound settings. If you prefer a more aggressive ride, opt for faster rebound to maintain speed and responsiveness. For more technical riding, a slower rebound may help to improve control and keep the rear wheel in contact with the ground.
Comparison with Similar Models
When compared to other rear shocks in the same class, the Fenix AIR stands out due to its combination of high adjustability, performance, and durability. The shock offers an impressive range of fine-tuning options, which many competitors lack. While other models may focus primarily on either high-speed compression or rebound, the Fenix AIR allows comprehensive control over both, making it suitable for riders who require precise suspension adjustments.
Compared to similar air shocks, the Fenix AIR offers a more robust and smooth bottom-out protection system, which is especially beneficial for riders who push their limits on aggressive descents. Additionally, the Fenix AIR’s air spring is known for maintaining its performance over time, making it a more reliable choice for long-term durability.
Compatibility with Other Drivetrain Components
The Fenix AIR rear shock is designed to work with a wide variety of bike frames, making it highly compatible with most modern mountain bike drivetrains. Its simple mounting system fits seamlessly into both standard and custom frame geometries. However, it is important to confirm the shock’s travel and eyelet specifications are compatible with your bike’s rear triangle before installation.
Riders should also ensure that the shock’s damping system is optimized for the intended use, particularly when paired with specific fork setups. When setting up a full suspension system, the Fenix AIR’s damping adjustments can be complemented by matching settings on the front fork, allowing for a balanced and responsive ride.