The Öhlins TTX22M Trunnion [paid link] rear shock is a high-performance suspension component designed to enhance the riding experience of mountain bikers. This article offers a comprehensive guide on the TTX22M Trunnion [paid link], including installation, maintenance, troubleshooting, optimization, and a comparison with similar models.

Installation of the TTX22M Trunnion Rear Shock

Proper installation is crucial to ensure the TTX22M Trunnion performs at its best. Below is a step-by-step guide to installing this rear shock:

Tools Required

• 5mm Allen wrench [paid link]
• Torque wrench [paid link]
• Shock pump
• Trunnion mount hardware (included)
• Suspension grease

Installation Steps:

1. Prepare the Bike Frame: Begin by ensuring the bike frame is clean and free from dirt or debris. This will prevent contamination during installation.
2. Remove the Old Shock: If replacing an existing shock, use a 5mm Allen wrench [paid link] to remove the bolts holding the previous shock. Keep the mounting hardware for later use if compatible.
3. Install the TTX22M Trunnion Shock: Place the Öhlins TTX22M into the trunnion mount on the frame. Ensure the shock is aligned correctly with the mounting holes.
4. Secure the Shock: Attach the shock using the provided mounting bolts. Tighten the bolts using the torque wrench [paid link], ensuring the manufacturer’s recommended torque values are followed.
5. Set the Shock Pressure: Using a shock pump, adjust the air pressure in the shock according to your weight and riding style. Refer to the Öhlins pressure chart for the appropriate settings.
6. Double-Check Installation: Before riding, verify all bolts are securely tightened and that the shock is installed correctly.

Adjustment and Fine-Tuning for Optimal Performance

The TTX22M Trunnion is designed for performance and adjustability. Proper adjustments allow you to fine-tune the shock to your riding conditions. Here are the key adjustment features:

Compression and Rebound Damping

The TTX22M features separate high-speed and low-speed compression adjusters, as well as rebound adjustment. Here’s how to adjust each:

• High-Speed Compression: This controls how the shock responds to rapid impacts. For aggressive riding or downhill, increase the high-speed compression to prevent bottoming out. If riding more technical trails, lower it for better traction.
• Low-Speed Compression: This affects how the shock reacts to slow, steady movements. For smoother rides, set low-speed compression to a lower setting, but for aggressive climbs, increase it for stability.
• Rebound: This controls how quickly the shock returns after compression. A slower rebound setting can help maintain traction on rough terrain, while a faster setting can provide a more responsive feel.

Sag and Spring Rate

To ensure optimal performance, adjust the shock’s sag according to your body weight and riding style. Ideal sag is typically 30% of the total shock stroke. Use the shock pump to adjust air pressure for the correct sag. A well-balanced sag helps the shock react effectively to trail features, improving comfort and control.

Hydraulic Lockout

If your TTX22M features a lockout function, use it for climbing or when you need the rear suspension to be firm. This feature prevents the shock from compressing under pedaling forces, improving efficiency on smooth surfaces.

Maintenance of the TTX22M Trunnion Rear Shock

Regular maintenance is essential to prolong the life of your TTX22M Trunnion and maintain its performance. Here’s a maintenance guide:

Cleaning the Shock

• After every ride, wipe down the shock with a clean cloth to remove dirt, mud, and debris. Pay special attention to the shaft and seals to prevent contamination.
• Occasionally, use mild soap and water to clean the shock if necessary, but avoid harsh chemicals that can damage the components.

Checking the Air Pressure

• Periodically check the air pressure using a shock pump. As air can gradually escape [paid link], ensuring the shock is properly inflated helps maintain consistent performance.
• Adjust the pressure according to your riding style, weight, and terrain type.

Inspecting the Seals

• The seals play a crucial role in keeping the shock’s internals protected. Inspect the seals for any signs of wear or damage. If you notice oil leakage or decreased performance, it may be time to replace the seals.

Servicing the Shock

• Öhlins recommends servicing the TTX22M Trunnion every 100 hours of riding or once a year, whichever comes first. During the service, the shock will be disassembled, cleaned, and re-oiled to maintain optimal performance.

Troubleshooting Common Set-Up Issues

While the TTX22M Trunnion is a high-performance shock, riders may encounter certain issues during setup or riding. Here are some common problems and their solutions:

Lack of Suspension Travel

• Cause: Insufficient air pressure or incorrect sag settings.
• Solution: Check the air pressure and adjust it according to the manufacturer’s recommendations. Ensure that the sag is set to the correct percentage of the shock’s travel.

Shock Bottoming Out

• Cause: Inadequate compression settings or excessive air pressure.
• Solution: Adjust the compression settings, particularly the high-speed compression. If bottoming out occurs during aggressive riding, consider increasing the high-speed compression. Alternatively, increase the air pressure to reduce excessive travel.

Unstable or Bouncy Ride

• Cause: Incorrect rebound setting or too much low-speed compression.
• Solution: Adjust the rebound to suit the terrain. If the ride feels too bouncy, try decreasing the rebound setting. Also, check the low-speed compression settings to ensure the shock is responsive but not overly firm.

Air Leakage

• Cause: Worn-out seals or improper installation.
• Solution: Check the seals for any visible damage or wear. If necessary, replace them. Ensure that the shock was installed correctly, with all bolts tightened to the specified torque.

Customization and Optimization for Better Performance

The Öhlins TTX22M Trunnion offers several options for customization, allowing riders to tailor the shock to their specific needs. Here are a few ways to optimize performance:

Spring Rate Selection

• Öhlins offers various spring options for the TTX22M, allowing riders to choose a spring rate that best matches their riding style and weight. Selecting the correct spring rate can dramatically improve comfort and performance, especially on technical trails or rough terrain.

Fine-Tuning Suspension Settings

• Regularly fine-tune the suspension settings, including compression and rebound damping, to match the specific conditions of the trails you ride. For example, adjust the compression for steep downhill rides or reduce the rebound for technical, root-filled terrain.

Comparison with Similar Models

The TTX22M Trunnion rear shock stands out in the market due to its superior damping performance, high adjustability, and build quality. When compared with similar models from brands like Fox and RockShox, the TTX22M offers:

• Better Damping Control: The dual-speed compression and rebound damping provide more precise adjustments than many competitor models, ensuring superior performance on both smooth and rough trails.
• Durability: Öhlins’ reputation for building high-end components shines through in the TTX22M. The shock is designed to last longer, even under extreme conditions.
• Customization: The ability to adjust spring rate and fine-tune compression and rebound settings makes the TTX22M more adaptable than many competitor shocks.

Understanding Compatibility with Other Drivetrain Components

The TTX22M Trunnion is compatible with most modern mountain bike drivetrains. However, it’s important to ensure compatibility with your frame’s mounting system. The trunnion mount system is more prevalent in newer mountain bike frames, but older frames may require an adapter.

Additionally, riders should consider the bike’s overall suspension geometry when selecting the TTX22M. While this shock provides a range of adjustments, it’s crucial to ensure the bike’s frame and fork are balanced in terms of travel and suspension performance for the best ride quality.