The TTX22M Trunnion [paid link] rear shock from Öhlins is a high-performance shock designed for serious mountain bikers and riders who demand precision, comfort, and control. Known for its advanced technology and durability, the TTX22M Trunnion [paid link] excels in providing riders with unmatched suspension performance on challenging terrains. This article explores the installation, adjustment, maintenance, troubleshooting, customization, and optimization of the TTX22M Trunnion rear shock, while also comparing it with similar models to help riders make informed decisions.

Installation of the TTX22M Trunnion Rear Shock

Installing the TTX22M Trunnion rear shock is a straightforward process if done correctly. However, it’s crucial to follow specific steps to ensure that the shock is mounted properly for optimal performance and safety.

Tools Required:

• Torque wrench [paid link]
• 5mm Allen wrench [paid link]
• 8mm spanner wrench
• 10mm spanner wrench
• Rags for cleaning
• Grease (preferably suspension grease)

Step-by-Step Installation:

1. Remove the Existing Shock: Before installing the TTX22M Trunnion, remove the existing rear shock by using the 5mm Allen wrench [paid link] to undo the bolts on the shock mounts.
2. Clean the Shock Mounts: Wipe down the shock mounts using a rag to remove dirt and debris. A clean surface ensures proper mounting and minimizes wear.
3. Install the TTX22M Trunnion Shock: Place the new shock into the trunnion mount. Ensure the shock’s eyelet and mounting hardware align correctly with the frame.
4. Torque the Mounting Bolts: Using a torque wrench [paid link], tighten the bolts to the manufacturer’s recommended torque settings. This step is crucial to avoid damaging the shock or the frame.
5. Recheck Mounting Alignment: After securing the bolts, double-check that the shock is properly aligned and that the frame doesn’t flex or misalign when the bike is under load.

Proper installation is essential to achieving the full performance potential of the TTX22M Trunnion rear shock, ensuring safe and smooth rides.

Adjustment of the TTX22M Trunnion Rear Shock

The TTX22M Trunnion features various adjustability settings to cater to different riding styles and terrain types. Understanding how to adjust the shock for your specific needs can significantly enhance comfort, control, and overall bike handling.

Compression Damping:

The TTX22M Trunnion comes with an externally adjustable compression damping feature, allowing you to fine-tune how the shock reacts to the forces encountered on the trail.

• High-speed Compression: Adjust the high-speed compression setting to control how the shock absorbs fast, sharp impacts (e.g., hitting a rock garden). A firmer setting provides better stability, while a softer setting offers more comfort.
• Low-speed Compression: For better pedaling efficiency and support, adjust the low-speed compression setting. Tightening it can reduce unwanted suspension sag during pedal strokes, while loosening it improves comfort on rough terrain.

Rebound Damping:

The rebound damping controls how quickly the shock extends after compression. Adjusting this setting helps to manage the bike’s stability after impacts and ensures smooth traction.

• Faster Rebound: For riders who prefer a lively, responsive feel, a faster rebound setting can be used.
• Slower Rebound: On rougher, more technical terrain, a slower rebound setting prevents the shock from bouncing too quickly, improving control.

Air Spring Pressure:

Adjust the air spring pressure to match your body weight and riding style. The TTX22M Trunnion offers a wide range of air pressure settings, which can be fine-tuned for optimal suspension travel and bike geometry.

Maintenance of the TTX22M Trunnion Rear Shock

To ensure longevity and consistent performance, regular maintenance of the TTX22M Trunnion is crucial. This includes cleaning, checking for wear, and ensuring the shock is functioning smoothly.

Cleaning and Inspection:

• Clean the Shock Regularly: After each ride, especially in muddy or dusty conditions, clean the shock body with a soft cloth to remove dirt and debris. Make sure to wipe around the seals to prevent contamination.
• Check for Leaks: Inspect the shock for any signs of oil leakage or damage to the seals. If leakage is detected, the seals may need to be replaced.
• Inspect the Mounting Hardware: Regularly check the mounting bolts for tightness and any signs of wear or damage.

Rebuilding the Shock:

The TTX22M Trunnion, like most high-end suspension shocks, requires periodic servicing. Öhlins recommends servicing the shock every 100-150 hours of riding or once a year, whichever comes first.

• Internal Servicing: This involves draining the oil, replacing worn seals, and refreshing the air spring. If you’re unsure how to do this, it’s recommended to take the shock to an authorized service center.
• Recharging the Nitrogen Chamber: If the nitrogen chamber loses pressure, it may need to be recharged to maintain proper performance.

Troubleshooting Common Set-Up Issues

Despite its superior design, the TTX22M Trunnion may experience common setup issues, especially during initial installation. Here are some common problems and solutions:

Lack of Rebound Control:

• Problem: If the rear shock feels bouncy or unstable after a compression, it could be due to improper rebound damping.
• Solution: Adjust the rebound damping by turning the rebound knob to slow down the extension of the shock. A slower rebound ensures better control over rough terrain.

Too Much Sag:

• Problem: If the shock feels overly soft or if the bike bottoms out easily, there may be too much sag.
• Solution: Increase the air spring pressure to reduce sag. If the shock continues to bottom out, it may require a firmer compression setting.

Noisy Shock:

• Problem: A squeaking or popping noise during compression could indicate inadequate lubrication or dirty seals.
• Solution: Clean the shock thoroughly and apply suspension grease to the moving parts. If the noise persists, consider servicing the shock to replace worn seals.

Customization and Optimization for Better Performance

The TTX22M Trunnion rear shock can be customized to suit various riding styles and terrain preferences. By experimenting with different settings, riders can achieve the perfect suspension for their needs.

Fine-Tuning Suspension Settings:

• Compression and Rebound: Adjusting compression and rebound settings based on the type of terrain you ride on can significantly impact performance. For smoother trails, you may prefer a softer setting, while rough, technical descents may require firmer compression for better control.
• Air Pressure: Riders who regularly switch between different terrains might adjust the air pressure based on the demands of the ride. For aggressive downhill riding, slightly higher air pressure could prevent bottoming out, while lighter air pressure is ideal for cross-country rides.

Performance for Different Terrains:

• Cross-Country: For cross-country or trail riding, aim for a lighter setup with lower compression damping and slightly less air pressure to maintain comfort without sacrificing pedaling efficiency.
• Enduro and Downhill: For aggressive enduro or downhill riding, opt for a firmer compression setting and higher air pressure. This configuration will provide stability during high-speed descents and technical sections.

Comparison with Similar Models

When comparing the TTX22M Trunnion to other rear shocks in the market, such as the RockShox Super Deluxe or Fox Float X2, the TTX22M stands out due to its advanced twin-tube damper design, which ensures superior oil control and better heat dissipation. This results in more consistent performance under heavy usage.

• RockShox Super Deluxe: While the Super Deluxe offers excellent performance, the TTX22M Trunnion’s dual-flow technology provides better compression and rebound adjustments for more precision on technical rides.
• Fox Float X2: The Float X2 is a great competitor but lacks the customizable compression damping and twin-tube design of the TTX22M, which translates to smoother handling in extreme conditions.

Compatibility with Other Drivetrain Components

The TTX22M Trunnion rear shock is compatible with most modern mountain bike frames that feature trunnion-style shock mounts. However, it’s essential to ensure that the shock’s stroke length and mounting dimensions are compatible with your frame before installation.

• Frame Compatibility: Check your frame’s specifications for the correct mounting type and dimensions (trunnion or eyelet). If in doubt, consult with the frame manufacturer or a professional mechanic.
• Drivetrain Compatibility: Although the rear shock doesn’t directly interact with the drivetrain, the suspension settings can affect how the bike performs in tandem with the drivetrain. Adjust the shock settings to complement your shifting and pedaling style for optimal performance.