The Öhlins STX22 Coil rear shock is a high-performance suspension component designed for a wide range of mountain biking applications. As with any advanced suspension system, regular preventative maintenance is essential to ensure optimal performance, durability, and rider safety. In this guide, we will cover everything from installation to maintenance, troubleshooting, and performance optimization for the STX22 Coil rear shock.
Tools Required
To properly maintain and service your STX22 Coil rear shock, you will need the following tools:
- 8mm, 10mm, and 14mm wrenches
- Torque wrench [paid link] (for precise tightening)
- Shock pump
- Oil for suspension (Öhlins recommended)
- Clean rags or cloths
- Isopropyl alcohol or degreaser
- Rubber gloves
- Specialized shock oil extractor tool (if needed for servicing the shock internally)
- Teflon tape or thread sealant
Installation of the STX22 Coil Rear Shock
Step 1: Preparing the Bike Frame
Before installing the STX22 Coil rear shock, ensure your bike frame is properly prepared. The shock mount areas should be free of dirt, debris, and old lubricant. Clean the shock mounts and verify that they are in good condition, as damaged mounts can cause issues during installation and affect the shock’s performance.
Step 2: Installing the Shock
Place the STX22 Coil rear shock into the frame’s rear shock mount. Ensure that the mounting holes align correctly with the shock eyelets. Insert the shock’s hardware (bushings or bolts) into the frame’s mounts, and make sure everything is secured.
Step 3: Tightening the Bolts
Using your 10mm and 14mm wrenches, tighten the mounting bolts on both sides of the shock. Be sure to follow the torque specifications provided by Öhlins for proper tightening. It’s crucial not to overtighten or under-tighten these bolts, as this can affect the shock’s performance and the safety of your bike.
Step 4: Setting the Sag and Pressure
After the shock is installed, use a shock pump to adjust the air pressure for the correct sag. The STX22 Coil uses a coil spring, but fine-tuning the air pressure or adjusting the preload on the coil can affect your riding experience. Refer to the Öhlins setup guide for the correct pressure range and sag settings based on your weight and riding style.
Regular Maintenance
Cleaning and Inspection
Regularly clean your STX22 Coil rear shock to ensure it operates smoothly and free from contaminants. Use a clean rag and isopropyl alcohol to wipe down the shock and surrounding areas, removing any dirt or grime that could potentially damage the shock’s seals. Pay special attention to the shock shaft and the eyelets. If you notice any significant buildup, clean it promptly to avoid any risk of compromising the shock’s performance.
Checking for Leaks
One of the most common issues with rear shocks is oil leaks, which can compromise suspension performance. Regularly check for signs of oil leakage around the seals, shock body, or adjuster knobs. If you notice any oil on the shock or around the mounting points, it’s crucial to address the issue as soon as possible.
Inspecting the Coil Spring
Over time, the coil spring can lose its tension or degrade in performance. Regularly inspect the spring for signs of damage, rust, or wear. If you notice any irregularities, consider replacing the coil spring. Ensure that the coil spring is properly lubricated and seated in the shock’s spring seat to maintain smooth performance.
Servicing the STX22 Coil Rear Shock
When to Service
The STX22 Coil rear shock should be serviced periodically, typically every 50-100 hours of riding, depending on conditions and frequency of use. However, servicing should also be performed if you notice performance issues such as reduced damping, poor rebound, or a noticeable decrease in ride quality.
Internal Servicing
If your STX22 Coil rear shock requires internal servicing, it is recommended to consult a professional mechanic, as disassembling and servicing the shock internally requires specialized tools and expertise. Öhlins provides service kits and detailed instructions for professional servicing, including oil changes, seal replacement, and damping adjustments.
Lubrication
The internals of the shock need to be properly lubricated to function effectively. Regular lubrication of the shock’s seals and bushings helps reduce friction and ensures that the shock performs at its best. Always use the recommended suspension oil from Öhlins for this purpose to prevent compatibility issues.
Troubleshooting Common Issues
Reduced Damping or Lack of Rebound
If the shock feels soft or the rebound is inconsistent, this could indicate a lack of oil or air in the shock. Inspect the shock for any signs of leakage or damage, and if necessary, perform an oil change or re-grease the components. Ensure that the damping adjuster is properly set and clean from any debris.
Noisy Shock
Noises from the shock can occur when there is inadequate lubrication or when dirt has accumulated around the shock body. Clean the shock thoroughly and ensure it is lubricated appropriately. If the noise persists, check the shock’s mounting points for any looseness or damage.
Poor Performance or Sag Issues
If the STX22 Coil rear shock is sagging too much or doesn’t feel responsive, check the preload adjustment and air pressure. Adjust the preload to suit your weight and riding style. If the coil spring is too soft or too stiff for your needs, you may need to replace it with a more suitable spring.
Customization and Optimization for Performance
Adjusting the Damping
The STX22 Coil rear shock features adjustable compression and rebound damping, allowing you to fine-tune the shock for specific riding conditions. For smoother, faster rides, you may prefer softer compression settings, while stiffer settings are better suited for aggressive downhill riding. Regularly adjust the damping to match the terrain and weather conditions for optimal performance.
Coil Spring Tuning
The coil spring is one of the most important components for customizing the ride quality. If you find the shock too stiff or too soft, consider changing the coil spring to one with a different spring rate. Öhlins provides a variety of coil springs for different weights and riding styles, making it easy to tailor the shock’s performance to your preferences.
Tuning for Different Terrain
Different riding terrains demand different suspension settings. For example, when riding on smooth trails, you might want a lower compression setting for a smoother ride, while rougher trails or technical sections may require firmer compression settings to handle impacts better. Rebound settings can also be adjusted based on terrain to ensure that the shock returns quickly enough without feeling overly harsh.
Comparison with Similar Models
The STX22 Coil rear shock is an excellent choice for riders seeking a durable and customizable shock. Compared to other models in Öhlins’ range, such as the TTX Air or RXF 36, the STX22 offers a simpler, more robust coil spring system that is less maintenance-intensive, making it ideal for riders who prefer a more hands-on approach to their suspension setup. The coil spring also provides a more consistent and predictable feel, which is often favored by riders who enjoy technical and aggressive riding styles.
While the STX22 Coil offers exceptional value and performance, riders looking for the lightest setup or more advanced air-spring systems may consider alternatives like the TTX Air. However, for riders prioritizing reliability, adjustability, and ease of use, the STX22 Coil remains one of the best choices in its category.
Compatibility with Other Drivetrain Components
The STX22 Coil rear shock is designed to integrate seamlessly with various bike frames and drivetrain systems. It is compatible with most modern mountain bike frames that support coil shocks and can easily be paired with Öhlins’ other suspension components for a fully optimized setup. However, always check compatibility with your bike’s frame and suspension design before installation.
Additionally, while the STX22 Coil rear shock performs exceptionally well with high-end drivetrains, riders should ensure that their frame’s geometry and rear triangle are designed to accommodate coil shocks. This will ensure the best performance and prevent any frame compatibility issues during installation.