The STX22 Coil rear shock by Öhlins is a highly regarded component designed for performance and durability. Over time, however, even the most well-made shocks require maintenance and rebuilding. Rebuilding your STX22 Coil rear shock at home can save you money and keep your bike performing optimally. This guide will take you through the process step-by-step, covering everything from installation to troubleshooting, and even customizing for better performance.

Tools Required

• Shock pump
• Allen wrenches [paid link] (5mm, 6mm)
• Torque wrench [paid link]
• Oil seal driver
• Suspension fluid (Öhlins recommended)
• Coil spring tool
• Rags or shop towels
• 10mm spanner
• Circlip pliers
• O-ring pick tool
• Bleed kit [paid link] (if needed)

Disassembly of the STX22 Coil Rear Shock

Before starting the rebuild process, it’s important to safely remove the shock from the bike and prepare it for disassembly.

1. Remove the shock from the bike:
   • Use the appropriate wrenches to remove the bolts securing the shock to the frame and swingarm.
   • Use a 5mm or 6mm Allen wrench [paid link], depending on your shock’s mounting system, to remove the shock from the rear triangle.
2. Prepare for disassembly:
   • Place the shock on a clean, flat work surface to prevent contaminants from entering the shock during the rebuild.
   • Make sure to have rags or shop towels to keep the area clean.

Step-by-Step Rebuilding Process

1. Remove the Coil Spring

• Use the coil spring tool to compress the spring and release any tension.
• Once the spring is safely compressed, remove the retaining clip and slide the coil spring off the shock body.
• Inspect the coil spring for wear and tear. Replace it if you notice any damage or excessive wear.

2. Remove the Damper Assembly

• Use a 10mm spanner to remove the top cap from the shock body.
• Carefully extract the damper assembly from the shock body. Pay close attention to the orientation of parts to ensure proper reassembly.

3. Disassemble the Damper Cartridge

• Using a 6mm Allen wrench [paid link], remove the damper cartridge from the shock body.
• Be cautious with the damper oil during disassembly. Drain it into a container for proper disposal.

4. Clean the Components

• Thoroughly clean all parts, including the shock body, damper, and spring, using a clean rag.
• Avoid harsh solvents; use only mild cleaners designed for suspension components.
• Inspect all parts for damage. Pay close attention to the oil seals and O-rings, replacing any that appear worn or damaged.

5. Inspect the Oil Seal

• Use the O-ring pick tool to carefully remove the oil seal from the shock body.
• Check the oil seal for any signs of wear, cracks, or damage. If needed, replace it with a new one.
• Ensure the seal is well lubricated before installation.

6. Install the New Oil Seal and Damper

• Carefully reinstall the oil seal using the oil seal driver. Ensure it is seated properly and flush against the shock body.
• Install the damper assembly back into the shock body, securing it with the 6mm Allen wrench.

7. Add Suspension Fluid

• Add the recommended suspension fluid (Öhlins fluid for STX22 Coil) into the shock body, following the manufacturer’s specifications.
• Ensure the fluid level is correct, as improper fluid levels can negatively affect the performance of the shock.

8. Reassemble the Coil Spring

• Slide the coil spring back onto the shock body, making sure it’s oriented correctly.
• Reinstall the retaining clip to secure the spring in place.

9. Reinstall the Shock Cap

• Tighten the shock cap onto the top of the damper assembly using the 10mm spanner. Be sure to torque the cap to the manufacturer’s recommended setting to avoid over-tightening.

10. Reinstall the Shock on the Bike

• Place the shock back into its mounting points on the frame and swingarm.
• Secure the shock using the appropriate bolts and torque them to the recommended settings.
• Recheck the alignment and ensure the shock is securely mounted.

Adjustments and Settings

After the rebuild, fine-tuning your STX22 Coil rear shock is essential for achieving the best performance.

• Air Pressure: Use the shock pump to adjust the air pressure to match your weight and riding style. The recommended pressure range can usually be found in the owner’s manual or on the shock itself.
• Rebound Adjustment: Adjust the rebound damping to suit your riding style. Turning the rebound knob clockwise will slow the rebound, while turning it counterclockwise will speed it up.
• Compression Setting: Fine-tune the compression setting based on the terrain and your preferences. Softer compression settings will provide more sensitivity, while firmer settings can offer better support for aggressive riding.

Troubleshooting Common Set-Up Issues

• Leaking Shock: If you notice oil leaking from the shock after a rebuild, this could indicate a damaged oil seal or improperly installed seals. Check the seals, and replace them if necessary.
• Reduced Performance: If the shock feels sluggish or unresponsive after the rebuild, there may be an issue with the oil level, air pressure, or rebound settings. Double-check fluid levels and adjust the settings accordingly.
• Noise from the Shock: If you hear clunking or other noises, inspect the coil spring for proper installation and ensure the shock mountings are secure. Noise can also be caused by insufficient lubrication of the oil seals.

Customization and Optimization

The STX22 Coil rear shock can be further customized to suit different types of riding and rider preferences. You can experiment with different spring rates to match your riding style and terrain. Riders who primarily ride downhill may benefit from a stiffer spring, while cross-country riders may prefer a more compliant spring for better comfort and traction.

Comparison with Similar Models

Compared to other shocks in the Öhlins lineup, such as the TTX22M, the STX22 Coil is designed for riders who want a more traditional, coil-sprung rear shock with excellent durability and simple maintenance. The TTX22M, on the other hand, offers adjustable damping for even more precise tuning, but the STX22 Coil remains a popular choice for riders who prioritize reliability and performance in rugged conditions.

Compatibility with Other Drivetrain Components

The STX22 Coil rear shock is compatible with a wide range of drivetrain components, including both 1x and 2x drivetrains. It’s important to ensure that the shock is correctly matched to the bike’s geometry and suspension design. The shock’s adjustable settings allow it to work with different types of rear triangle setups, making it a versatile option for various bike models. However, be sure to check the specific requirements for your bike frame before purchasing or rebuilding the shock to ensure compatibility.