The Fenix COIL [paid link] rear shock by Fast Suspension is a high-performance component designed for mountain bike enthusiasts seeking exceptional durability, responsiveness, and customization. Whether you’re a competitive rider or a weekend warrior, understanding why this rear shock stands out can help you make an informed decision for your bike setup. This guide will delve into the key features of the Fenix COIL [paid link] rear shock, covering installation, adjustment, maintenance, troubleshooting, and how it compares to other models.

Key Features of the Fenix

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COIL Rear Shock

The Fenix COIL rear shock is designed to meet the needs of riders looking for a versatile [paid link] and reliable suspension system. With its robust coil spring design, the Fenix COIL offers superior performance, especially in demanding riding conditions. The shock combines high-quality components and fine-tuned adjustment features, making it suitable for a wide range of riders.

Durability and Build Quality

The Fenix COIL rear shock features a high-strength aluminum body and a durable steel coil spring. This construction ensures long-lasting performance, especially for riders who engage in aggressive riding styles, such as downhill racing or technical trail riding. The shock’s design helps distribute forces evenly, reducing wear and tear on key components.

Coil Spring Design for Consistent Performance

One of the standout features of the Fenix COIL rear shock is its coil spring design. Unlike air-sprung shocks, which can be affected by temperature changes and pressure fluctuations, the coil spring maintains consistent performance throughout the ride. This makes the Fenix COIL a more predictable and reliable choice for riders who demand optimal performance in various conditions.

Adjustable Compression and Rebound Settings

The Fenix COIL offers precise adjustability for both compression and rebound, allowing riders to fine-tune their suspension setup based on personal preferences and riding style. The adjustable compression allows for better control over the shock’s damping, while the rebound adjustment ensures smooth and controlled returns after compression. This level of customization provides enhanced comfort and efficiency for a wide variety of riding situations.

Installation of the Fenix COIL Rear Shock

Proper installation of the Fenix COIL rear shock is crucial to ensure optimal performance and safety. Follow these steps for a smooth installation process:

Tools Required:

• 5mm and 6mm Allen wrenches [paid link]
• Torque wrench [paid link] (for accurate torque specifications)
• Shock mounting hardware (typically included with the shock)
• Grease for the mounting hardware
• Rags or cleaning cloths for cleaning the shock and mounting area

Installation Steps:

1. Prepare the Mounting Area: Clean the rear triangle of the bike and ensure the shock mount points are free of dirt and debris.
2. Remove the Old Shock (if applicable): Use the appropriate Allen wrenches [paid link] to remove the bolts securing the old rear shock. Keep the bolts as they may be reused with the Fenix COIL rear shock.
3. Install the New Shock: Align the Fenix COIL rear shock with the mounting points on the frame. Insert the shock into place, ensuring the eyelets or mounting hardware fit securely.
4. Tighten the Bolts: Using the torque wrench [paid link], tighten the mounting bolts to the manufacturer’s recommended torque settings. This step ensures the shock is firmly in place without risking damage to the frame or shock.
5. Lubricate and Inspect: Apply a thin layer of grease to the mounting bolts to prevent corrosion. Check all connections to ensure the shock is correctly aligned and securely mounted.

Adjustment and Tuning of the Fenix COIL Rear Shock

One of the key reasons riders choose the Fenix COIL rear shock is its adjustability. Proper adjustment helps optimize comfort, control, and performance based on the rider’s weight, riding style, and terrain type.

Compression Adjustment

The Fenix COIL features a user-friendly compression adjustment dial, typically located at the shock’s reservoir. The compression adjustment controls how the shock behaves under force, allowing you to tune it for different riding conditions:

• Low-speed compression: Adjust this for general terrain and trail riding.
• High-speed compression: Fine-tune for faster impacts or aggressive downhill rides.

Rebound Adjustment

Rebound controls how quickly the shock returns after compression. If the rebound is too fast, it can cause the bike to bounce uncontrollably. Conversely, if it’s too slow, the shock will not recover quickly enough for the next impact. Adjust the rebound to achieve smooth and controlled performance. Typically, turning the rebound knob clockwise slows the rebound, while counterclockwise speeds it up.

Sag Setting

Sag is the amount the rear shock compresses under the rider’s weight. Setting the correct sag is crucial for maintaining proper geometry and suspension performance. A general rule of thumb is to set the sag to about 25-30% of the shock’s total travel. Use a shock pump to adjust the coil preload if necessary, ensuring the rider’s weight is correctly supported by the shock.

Maintenance of the Fenix COIL Rear Shock

Proper maintenance ensures the longevity and performance of the Fenix COIL rear shock. Regular inspection and care are vital for keeping the shock in optimal working condition.

Cleaning and Lubrication

• Clean the shock regularly, especially after rides in muddy or wet conditions. Use a damp cloth to wipe down the shock body and ensure no dirt or debris builds up around the shock’s seals.
• Apply a light coat of grease to the mounting hardware to reduce friction and prevent corrosion.

Spring Preload Adjustment

Over time, the coil spring may need adjustments depending on the rider’s weight and changes in riding style. Adjust the preload by turning the coil spring’s preload collar to fine-tune the suspension. Always ensure that the spring is properly tensioned before riding.

Inspection and Servicing

Inspect the shock for signs of wear, including leaks, damaged seals, or unusual noises. If you notice any issues, it’s best to take the shock to a professional for servicing. Regular servicing ensures that internal components, such as the damper, are functioning correctly.

Troubleshooting Common Issues with the Fenix COIL Rear Shock

Despite its durability, the Fenix COIL rear shock may occasionally experience issues. Here are some common problems and how to resolve them:

Problem: Shock Bottoming Out

• Cause: The shock may bottom out if the compression damping is too soft or the spring preload is insufficient for the rider’s weight.
• Solution: Increase the compression settings or adjust the spring preload to reduce sag and increase support.

Problem: Excessive Rebound

• Cause: The shock may rebound too quickly after compression.
• Solution: Adjust the rebound knob to slow the rebound speed, ensuring the shock returns smoothly without causing instability.

Problem: Noisy Shock

• Cause: A noisy shock could be caused by a lack of lubrication or dirt in the shock’s seals.
• Solution: Clean the shock and lubricate the mounting hardware. If the noise persists, inspect the seals for wear or damage.

Customization and Optimization for Better Performance

The Fenix COIL rear shock offers several options for customization, making it an ideal choice for riders looking to fine-tune their suspension setup. Depending on the rider’s preferences, adjustments can be made to suit specific riding styles, from aggressive downhill racing to cross-country rides.

Adjusting for Different Riding Styles

• Downhill and Enduro Riding: For aggressive riders, increase the compression settings and ensure the rebound is slow to maintain control during high-speed descents.
• Cross-Country Riding: For lighter riders and smoother trails, decrease the compression and rebound settings for a more responsive feel.

Comparison with Other Rear Shocks

When comparing the Fenix COIL rear shock to other models, it’s important to consider factors such as durability, adjustability, and performance. The Fenix COIL stands out in its class due to its coil spring design, which offers consistent performance regardless of external factors such as temperature or pressure fluctuations. Unlike air shocks, which require frequent maintenance to adjust air pressure, the Fenix COIL offers more reliable performance with less frequent adjustments.

In contrast to more expensive models, the Fenix COIL offers a balance of performance and value, making it an excellent option for riders seeking reliable suspension without breaking the bank.

Compatibility with Other Drivetrain Components

The Fenix COIL rear shock is designed to work seamlessly with a wide range of mountain bike drivetrains. It is compatible with most modern frame designs and is particularly effective for riders who prioritize coil spring suspension systems. While the shock itself does not directly impact the drivetrain, ensuring that the shock’s travel and geometry match your bike frame is crucial for maintaining optimal performance. Always check compatibility with your bike’s rear triangle and suspension system before installation.

By understanding these features and adjustments, riders can optimize their Fenix COIL rear shock to achieve the best possible performance, durability, and comfort.