The STX22 Air Rear Shock from Öhlins is a high-performance shock designed for a wide range of cyclists, from enthusiasts to competitive riders. Maintaining this shock is essential to ensure optimal performance and longevity, especially under the constant stress of aggressive riding. In this guide, we will cover the steps for servicing your STX22 Air, including installation, adjustment, troubleshooting, and maintenance. By the end of this guide, you’ll have all the information necessary to keep your shock in peak condition.
Tools Required
Before beginning the service of your STX22 Air Rear Shock, gather the following tools:
- 5mm, 6mm, and 8mm Allen wrenches [paid link]
- Torque wrench [paid link] (up to 50 Nm)
- Öhlins-specific seal driver tool
- Oil catch pan
- Rebound and compression adjustment tool
- 15mm or 17mm socket wrench
- Clean rags and degreaser
- Öhlins oil (specific to STX22 Air)
- Shock pump (for pressure adjustments)
- Teflon grease
Installation of the STX22 Air Rear Shock
Installing your STX22 Air Rear Shock is straightforward, but ensuring proper torque settings and alignment is critical for performance and safety.
- Position the Shock:
- Carefully align the shock with the mounting points on your bike’s frame. Ensure that the shock’s eyelets and bushings are correctly positioned.
- Attach the Upper Mount:
- Insert the top eyelet into the frame’s upper mount. Use the appropriate bolt and tighten it to the manufacturer’s recommended torque value (typically 8-10 Nm). Do not overtighten, as this can cause damage to the frame or shock.
- Install the Lower Mount:
- Similar to the upper mount, align the bottom of the shock with the lower mount on the frame. Use the proper bolt and tighten to the recommended torque (usually around 12-15 Nm).
- Check Alignment:
- Ensure that the shock is properly aligned and the bushings are not under undue stress. This will prevent premature wear and enhance the shock’s performance.
- Pressure Setting:
- Once the shock is installed, use a shock pump to set the correct air pressure. Refer to the manufacturer’s specifications for your rider weight and desired sag setting.
Adjustment and Customization
The STX22 Air shock offers a variety of adjustments to cater to different riding styles and terrain. Key adjustments include:
Rebound Adjustment
The rebound adjustment controls how quickly the shock returns to its normal position after compression. Adjusting this setting affects the bike’s handling and comfort.
- To Adjust:
- Locate the rebound knob (usually at the bottom of the shock).
- Turn the knob clockwise to slow down the rebound or counterclockwise to speed it up.
- Fine-tune until you achieve the desired handling, ensuring the shock doesn’t rebound too quickly, which can cause instability.
Compression Adjustment
The compression setting affects how the shock behaves under load, such as when hitting bumps or landings. The STX22 Air shock allows for high and low-speed compression adjustments.
- To Adjust:
- Use the compression tool to adjust the high-speed compression (affecting larger impacts) and low-speed compression (affecting smaller, repeated bumps).
- Start with low-speed compression and set it to the middle range. Adjust high-speed compression to match the terrain and riding style.
Air Pressure
The air pressure setting is crucial for determining the shock’s overall sag and support. Adjust the air pressure based on your rider weight and personal preference.
- To Adjust:
- Use a shock pump to adjust the air pressure.
- Check the sag by sitting on the bike in your riding position and measuring the amount of travel used by the shock. Aim for around 30-35% of the total travel for a balanced setup.
Regular Maintenance and Servicing
Routine maintenance of your STX22 Air Rear Shock helps to ensure long-lasting performance and prevent issues down the road. Follow these steps every 6-12 months, depending on the intensity of your riding.
- Clean the Shock:
- After each ride, clean the shock body with a rag and some degreaser to remove dirt and debris. Pay special attention to the seals and bushings, as dirt accumulation can lead to premature wear.
- Inspect Seals and Bushings:
- Check the shock’s seals for any signs of wear or damage. Replace them as necessary to prevent air leaks and loss of performance.
- Oil Maintenance:
- Periodically change the oil in the shock to ensure smooth operation. Öhlins recommends using their specific oil for the STX22 Air model. Over time, the oil can break down, reducing performance and responsiveness.
- Drain the old oil and replace it with fresh oil, following the manufacturer’s guidelines for oil volume and type.
- Check Air Can and Chamber:
- Inspect the air can and chamber for leaks or damage. If you notice any issues, take the shock to a professional for service. Air leakage can result in inconsistent shock performance and loss of pressure.
Troubleshooting Common Set-Up Issues
If your STX22 Air Rear Shock isn’t performing as expected, there are several common issues you may need to troubleshoot.
Insufficient Rebound or Compression Control
- Possible Cause: Incorrect rebound or compression settings.
- Solution: Double-check your rebound and compression adjustments. Ensure that the settings match the terrain and your riding style. If the shock still feels off, try adjusting the air pressure.
Loss of Air Pressure
- Possible Cause: Leaking seals or damaged air can.
- Solution: Inspect the seals and check for visible damage or leaks. If you find any issues, replace the seals or take the shock to an expert for inspection.
Unusual Noises During Operation
- Possible Cause: Dirt or debris caught in the shock.
- Solution: Clean the shock and check for any visible dirt or grime around the seals or shock body. Cleaning the shock should resolve the issue, but if the noise persists, it may be a sign of deeper internal issues.
Compatibility with Other Drivetrain Components
The STX22 Air Rear Shock is compatible with a wide range of modern road and mountain bike frames. However, it’s essential to ensure that your bike’s suspension design, geometry, and shock mount standards match the specifications of the STX22 Air.
- Mounting Standards: The STX22 Air features a standard eyelet mount design, which is compatible with most frames that use a similar standard.
- Frame Compatibility: Check your frame’s specifications for the shock’s eyelet spacing and overall length to ensure proper fit.
- Drivetrain Compatibility: The shock works well with most modern drivetrain setups, including both mechanical and electronic shifting systems. However, ensure that there is enough clearance around the shock for the rear triangle of the frame and the drivetrain components.
Comparison with Similar Models
The STX22 Air shock stands out due to its customizable features and robust air spring design, which delivers an excellent balance of performance and adjustability. While there are other high-quality shocks available, such as the Fox Float X and RockShox Super Deluxe, the STX22 Air is particularly favored for its ease of maintenance and consistent performance.
- Fox Float X: The Fox Float X offers a similar level of adjustability but may require more frequent servicing due to its internal damper design. The STX22 Air has an edge in terms of air pressure tuning and ease of maintenance.
- RockShox Super Deluxe: While the Super Deluxe offers impressive rebound and compression adjustments, the STX22 Air is often preferred for its smoother initial stroke and more progressive feel under load.
Conclusion
Maintaining the Öhlins STX22 Air Rear Shock is essential for ensuring long-term performance, smooth suspension travel, and a comfortable ride. By following the steps for installation, adjustment, and regular maintenance, you’ll get the most out of your shock. Troubleshooting issues promptly and ensuring compatibility with your bike’s frame will also help avoid problems in the future.