The Öhlins TTX22M Trunnion [paid link] rear shock is a premium shock designed to deliver exceptional performance, stability, and control, making it a popular choice for serious cyclists. Proper installation, adjustment, and maintenance are crucial for optimizing its performance. This guide will walk you through everything you need to know to get the most out of your TTX22M Trunnion [paid link], from installation to troubleshooting common issues and even customizing the shock for better performance.
Tools Required
- Torque wrench [paid link]
- 10mm socket wrench
- 2mm, 3mm, and 5mm Allen wrenches [paid link]
- Shock pump with a Schrader valve
- Fluid for air chamber (optional)
- Clean rag
- Threadlocker
- T25 Torx driver
- Shock mounting hardware (as required)
Installation of the TTX22M Trunnion
Installing the Öhlins TTX22M Trunnion rear shock is a straightforward process, but it requires attention to detail to ensure proper performance. Follow these steps for a secure and safe installation.
1. Remove the Old Shock
If you’re replacing an existing rear shock, start by removing it from your bike frame. Use your appropriate Allen wrenches [paid link] to remove the mounting bolts and carefully detach the shock from the frame. Ensure the bike is supported properly to prevent it from falling during the process.
2. Clean the Mounting Area
Before installing the new TTX22M Trunnion, clean the mounting areas thoroughly. This ensures no dirt, debris, or grime will interfere with the shock’s performance and longevity. Use a clean rag to wipe the frame and mounting points.
3. Install the TTX22M Trunnion Shock
Attach the shock to the frame, aligning the trunnion mount with the frame’s corresponding attachment points. The shock should be oriented with the trunnion eyelet facing the frame. Insert the bolts and hand-tighten them first.
4. Torque the Bolts
Once the shock is properly positioned, use a torque wrench [paid link] to tighten the mounting bolts to the manufacturer’s recommended torque setting (usually around 25-30Nm). It’s essential to use a torque wrench to avoid over-tightening, which could damage the frame or the shock.
5. Set the Sag and Pressure
Using a shock pump, adjust the air pressure in the TTX22M Trunnion according to the rider’s weight and preferences. Start with the recommended pressure and adjust as needed based on your riding style. Next, check the sag. The ideal sag is typically around 25-30% of the shock’s total travel. This will help the shock absorb impacts more effectively and provide better overall comfort.
Tuning the TTX22M Trunnion
The TTX22M Trunnion features a variety of adjustments that allow you to fine-tune its performance to your exact needs. Proper tuning ensures optimal performance for different terrains, riding styles, and rider weights. Here are the key adjustments you can make.
1. Rebound Adjustment
The TTX22M Trunnion has a rebound adjustment dial, which controls how quickly the shock returns after compression. To adjust the rebound:
- Turn the rebound dial clockwise to slow the rebound (making the shock return more slowly).
- Turn the dial counterclockwise to speed up the rebound (making the shock return more quickly).
Start with the rebound set to a middle position and adjust based on the terrain. If the bike feels unstable or bouncy, slow the rebound. If it feels sluggish or too slow to react to successive bumps, speed it up.
2. Compression Adjustment
The TTX22M also features a high-speed and low-speed compression adjustment. These settings control the shock’s ability to resist compression when hitting bumps or obstacles.
- Low-Speed Compression: Adjust this to control the shock’s behavior during slower, more controlled movements. If you prefer a more plush feel when riding on smooth terrain, dial back the low-speed compression. If you want more support during cornering or when pedaling, increase the low-speed compression.
- High-Speed Compression: This controls the shock’s response to faster impacts, such as drops or larger jumps. If you’re hitting rough trails or encountering large hits, increase the high-speed compression to prevent bottoming out.
3. Air Spring Volume
Adjusting the air spring volume can significantly affect how the shock behaves through its travel. By increasing the volume, the shock becomes more progressive, giving you more bottom-out resistance. Conversely, reducing the air spring volume will make the shock feel more linear and sensitive to small bumps. You can adjust the air spring volume by changing the volume spacers inside the shock, based on your preferred riding style.
Common Troubleshooting and Maintenance Tips
The Öhlins TTX22M Trunnion is a high-quality rear shock, but like any mechanical component, it may encounter issues over time. Here are a few common issues and how to troubleshoot them.
1. Shock is Too Soft
If the shock feels too soft or is bottoming out frequently, this may be due to too little air pressure in the shock. Ensure the air pressure is adjusted properly to match your weight and riding style. If the shock still feels too soft after adjusting the pressure, consider adding volume spacers or increasing the compression settings.
2. Shock is Too Stiff
If the shock feels too stiff and is not providing enough comfort, it may be due to too much air pressure. In this case, reduce the air pressure to make the shock more responsive. Additionally, reducing the compression settings can help soften the shock.
3. Rebound Issues
If the rebound is too slow or too fast, it can lead to a harsh ride or a lack of control. If you notice that the shock is not returning fast enough after compression, try adjusting the rebound setting. If the rebound is too quick, it can result in the shock feeling “bouncy.” Make small adjustments and test ride until you find the ideal setting.
4. Leaking Fluid or Air
If you notice fluid leaking from the shock or a loss of air pressure, it’s a sign that the shock may need a rebuild or seal replacement. Contact a professional mechanic or an Öhlins service center to get the shock checked and serviced.
Customizing the TTX22M Trunnion for Better Performance
For riders looking to push their performance to the next level, customizing the TTX22M Trunnion shock can make a significant difference. Consider the following upgrades and adjustments:
1. Adjust the Shock for Different Terrain
For aggressive riders who spend a lot of time on rough terrain, increasing the compression and using additional volume spacers can help prevent bottoming out. On the other hand, for cross-country or smooth trail riders, a softer setting with less compression will improve comfort and traction.
2. Optimize for Rider Weight
Make sure to set the air pressure based on your weight. Riders who are lighter may need to lower the air pressure or reduce the low-speed compression to ensure the shock absorbs bumps effectively. Heavier riders may need to increase air pressure or adjust compression settings for better support.
Comparison with Similar Models
When comparing the Öhlins TTX22M Trunnion with other rear shocks on the market, it’s clear that the TTX22M stands out in terms of overall performance and durability. Similar shocks like the Fox DHX2 and the RockShox Super Deluxe also offer great adjustability, but the Öhlins model tends to provide a smoother, more controlled ride, particularly in aggressive riding conditions. The TTX22M’s ability to fine-tune both low-speed and high-speed compression is a significant advantage over its competitors, giving riders more control over their suspension settings.
Understanding Compatibility with Other Drivetrain Components
The TTX22M Trunnion rear shock is compatible with a wide range of mountain bike frames and drivetrains. It works seamlessly with most modern mountain bikes equipped with a trunnion mount. However, it’s essential to check the frame’s specifications to ensure the shock’s length, stroke, and mounting hardware are compatible with your bike. Additionally, it pairs well with other high-end components such as Shimano or SRAM drivetrains, providing consistent performance across your bike’s suspension and drivetrain systems.