The Öhlins STX22 Coil rear shock is a highly regarded component in the world of mountain biking. Known for its durability and performance, it has gained a reputation among riders looking for top-tier suspension for demanding trail conditions. In this guide, we will delve into the installation, adjustment, maintenance, troubleshooting, and optimization of the STX22 Coil, as well as explore how it compares to similar models.

Installation of the STX22 Coil Rear Shock

Installing the STX22 Coil rear shock requires careful attention to detail, ensuring that the shock is properly mounted and aligned with the bike frame. Here’s a step-by-step guide to help you install it correctly.

1. Preparation
   • Gather necessary tools: a torque wrench [paid link], shock pump, and appropriate mounting hardware for your bike’s frame.
   • Clean the area where the shock will be installed to prevent dirt and debris from entering the components.
   • Verify that your frame is compatible with the STX22 Coil, especially regarding shock mounting dimensions and eye-to-eye length.
2. Remove the Existing Shock
   • Begin by removing the old shock. Loosen the mounting bolts at both the upper and lower shock mounts.
   • Carefully remove the shock from the frame, taking note of the orientation for reinstallation.
3. Mount the STX22 Coil
   • Position the STX22 Coil rear shock on the frame, ensuring the correct orientation. The Öhlins logo should be facing outward, and the coil spring should be positioned to provide clearance for the frame.
   • Insert the shock into the mounts, ensuring the eyelets fit correctly in the shock mounts of your bike.
   • Tighten the mounting bolts to the manufacturer’s recommended torque setting to ensure a secure installation.
4. Setup and Fine-Tuning
   • Use a shock pump to adjust the air pressure according to your weight and riding style. The STX22 Coil is a coil-over shock, so the spring preload will need to be adjusted to your rider weight.
   • Once installed, check for any play or movement in the shock to ensure proper mounting.

Adjustment of the STX22 Coil Rear Shock

The STX22 Coil rear shock offers multiple adjustments, allowing you to fine-tune the suspension to your personal preference. Adjusting the shock’s performance settings can significantly enhance your riding experience.

1. Preload Adjustment
   • The coil spring on the STX22 can be adjusted for preload. This affects the shock’s sag, which is essential for proper suspension performance. To adjust the preload, use the provided spanner wrench to turn the spring collar clockwise to increase preload or counterclockwise to decrease it.
   • Ideal sag for mountain biking is typically between 25% and 30% of the shock’s total travel.
2. Rebound Damping
   • The rebound damping controls how quickly the shock returns to its original position after compression. Adjusting this ensures the shock doesn’t bounce back too quickly or too slowly, which could affect your control and comfort.
   • To adjust, rotate the rebound dial on the bottom of the shock. Turning it clockwise increases rebound damping (slower return), while turning it counterclockwise decreases it (faster return).
3. Compression Damping
   • Compression damping controls the shock’s resistance during compression. It helps prevent bottoming out when hitting obstacles or landing hard.
   • The STX22 Coil features low-speed compression adjustment, usually controlled by a dial or knob near the shock’s body. Turning it clockwise increases compression damping (firmer), while turning it counterclockwise decreases damping (softer).
4. Volume Spacer Adjustments
   • Some riders may choose to install volume spacers within the shock to adjust the progression of the suspension curve. This change can increase the firmness of the shock at the end of its travel, which may be useful for heavier riders or those who encounter aggressive terrain.

Maintenance of the STX22 Coil Rear Shock

Proper maintenance ensures your STX22 Coil rear shock performs optimally over time. Regular servicing can prevent premature wear and maintain smooth operation.

1. Regular Cleaning
   • After each ride, clean the shock body using a soft cloth to remove dirt and debris. Avoid using harsh chemicals or high-pressure water, as these can damage the seals and shock components.
   • Pay special attention to the shock’s eyelets and mounting hardware, ensuring they remain free of dirt and grime.
2. Lubrication
   • Periodically apply a light layer of lubricant to the shock’s shaft and bushings. This will reduce friction and wear, ensuring smooth travel. Always use a lubricant recommended by Öhlins for best results.
3. Coil Spring Maintenance
   • The coil spring on the STX22 Coil should be checked for any signs of wear, such as scratches or rust. If damage is noted, it may be necessary to replace the spring to maintain shock performance.
   • Coil springs should be regularly cleaned to prevent buildup of dirt and debris, which can lead to wear and reduced performance.
4. Shock Service
   • Depending on usage and environmental conditions, the STX22 Coil may need to be serviced every 100-150 hours of riding. This service includes replacing the oil, seals, and other internal components. It’s best to have this service performed by a qualified technician at an Öhlins service center.

Troubleshooting Common Set-Up Issues

While the STX22 Coil rear shock is built for durability, like all suspension systems, it may experience some common set-up issues.

1. Excessive Sag
   • If you notice that the shock has excessive sag, it may be due to insufficient preload. Adjust the coil’s preload using the spanner wrench until the desired sag is achieved.
   • Alternatively, if the spring feels too soft, consider switching to a stiffer spring for better support.
2. Shock Bottoming Out
   • Bottoming out occurs when the shock compresses fully, causing a harsh bottoming feeling. To address this, increase the compression damping or add volume spacers to the shock. This will help manage big hits and improve performance on aggressive terrain.
3. Excessive Rebound or Slow Return
   • If the shock is either too fast or too slow in returning, adjust the rebound damping by turning the rebound dial. A slower return may be needed for heavy impacts, while a faster return is typically suited for smoother terrain.
4. Noise from the Shock
   • If you hear unusual noises coming from the shock, such as squeaking or clunking, it could be due to debris or lack of lubrication. Inspect and clean the shock, and apply appropriate lubrication to the moving parts.

Customization and Optimization

One of the primary advantages of the STX22 Coil rear shock is its ability to be customized for specific riding styles and conditions. Below are some tips for optimizing your shock setup:

1. Weight and Rider Style
   • Choose the correct coil spring rate based on your weight and riding style. A firmer spring is recommended for heavier riders or those riding aggressively, while a softer spring may be more suitable for lighter riders or those focused on cross-country trails.
2. Tuning for Terrain
   • For more technical or rocky trails, increase the low-speed compression damping and add volume spacers to prevent bottoming out. For smoother trails, consider reducing compression damping for a more plush ride.
3. Temperature Sensitivity
   • Keep in mind that temperature changes can affect suspension performance. It may be necessary to adjust the settings (particularly compression and rebound damping) depending on the riding conditions, such as colder or warmer temperatures.

Comparison with Similar Models

When comparing the STX22 Coil to other rear shocks on the market, such as the RockShox Super Deluxe Coil or the Fox DHX2, several key factors should be considered:

1. Build Quality
   • The Öhlins STX22 Coil is known for its superior build quality and long-lasting durability. It is designed to withstand extreme conditions, making it ideal for aggressive riding and harsh terrains.
2. Adjustability
   • The STX22 offers a range of adjustability options, including preload, rebound, and compression damping. While other models like the Fox DHX2 also offer extensive tuning, the STX22 stands out for its ease of use and precision.
3. Weight
   • The STX22 Coil tends to be slightly heavier than some air shocks, such as the RockShox Monarch, but it provides superior performance in terms of consistency and support under heavy loads.
4. Price
   • The Öhlins STX22 Coil is priced higher than some air shocks, but for riders who value consistent performance, it offers excellent value. Its durability and performance justify the higher price tag for serious mountain bikers.

Compatibility with Other Drivetrain Components

The STX22 Coil rear shock is designed to work with a wide range of mountain bike frames, but compatibility with other drivetrain components depends on the frame design and shock mounting standards. Ensure that your frame’s eye-to-eye length and stroke match the specifications of the STX22 Coil. Additionally, consider your bike’s travel requirements, as this shock is best suited for long-travel enduro and downhill bikes.