How to Rebuild Your TTX2Air Rear Shock at Home

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The Öhlins TTX2Air rear shock is a high-performance suspension component commonly found on advanced road bikes. It is known for its exceptional ride quality, durability, and versatility. Whether you’re a professional cyclist or an avid enthusiast, maintaining your TTX2Air rear shock is essential for optimal performance. Over time, air shocks may lose performance due to wear, contamination, or loss of air pressure. Rebuilding your TTX2Air rear shock at home can save money while ensuring your suspension continues to perform at its peak.

In this guide, we’ll walk you through the process of rebuilding your TTX2Air rear shock, covering everything from disassembly to reassembly, adjustment, and troubleshooting common issues.

Tools Required

  • 3mm, 4mm, 5mm, and 6mm Allen wrenches [paid link]
  • Torque wrench [paid link] (up to 10-15 Nm)
  • Shock pump
  • TTX2Air rebuild kit (O-rings, seals, bushings, etc.)
  • Clean lint-free cloths
  • Small container or tray for small parts
  • Shock fluid (Öhlins specific)
  • Silicone grease
  • Air compressor (optional)
  • Rubber mallet (optional)

Preparing for the Rebuild

Before you begin the rebuild process, it’s essential to prepare your workspace and gather all necessary tools. Ensure that the area is clean and free of debris to avoid contaminating the shock components. Having a clean environment is critical to the longevity of your rebuild.

Step 1: Remove the Shock from the Bike

  1. First, use the appropriate tools (usually a 5mm or 6mm Allen wrench [paid link]) to remove the shock from your bike.
  2. Make sure the bike is securely positioned, and remove the shock carefully by loosening the mounting bolts. Place the shock on a soft surface to avoid any damage to the body.
  3. Ensure the shock is depressurized before disassembling to avoid any air pressure-related accidents.

Step 2: Remove the Shock’s End Caps

  1. Start by using the correct-sized Allen wrench [paid link] to remove the end caps from both the air can and the main body of the shock.
  2. Gently tap the body of the shock with a rubber mallet to loosen the components, being careful not to damage the surface.
  3. Once the caps are off, inspect the internal components for any visible damage, such as cracks or excessive wear, and take note of any parts that need replacing.

Disassembly and Cleaning

Step 3: Disassemble the TTX2Air Rear Shock

  1. Begin disassembling the shock by removing the internal components, including the piston and damper assembly. Make sure to track the order and orientation of each part.
  2. Use the correct tools to gently remove the air spring components from the shock body. These can include the air sleeve and air piston.
  3. Carefully disassemble the damper section by removing the damping cartridge. This step may require additional tools to disconnect the rebound or compression adjusters from the damper body.

Step 4: Clean All Components

  1. With the shock disassembled, thoroughly clean each part. Use lint-free cloths to wipe down the shock body, piston, and damper.
  2. Clean all O-rings, seals, and internal parts to remove any dirt, grease, or debris. If any components appear worn or damaged, replace them with new parts from the rebuild kit.
  3. Pay special attention to the internal oil and fluid areas. If the fluid appears contaminated, ensure that it is fully drained from the shock before proceeding to reassemble.

Rebuilding the TTX2Air Rear Shock

Step 5: Install New Seals and O-Rings

  1. Begin by installing the new seals and O-rings in their respective positions, ensuring a proper fit. Applying a small amount of silicone grease to the O-rings can help prevent premature wear and ensure a smooth assembly.
  2. Place the new piston and damper assembly into the shock body, ensuring everything aligns correctly. Double-check the orientation of all parts according to the manufacturer’s guidelines.

Step 6: Fill the Shock with Fresh Oil

  1. Using the recommended shock fluid, fill the damper and air sections of the shock according to the specifications outlined in the Öhlins service manual.
  2. Ensure the correct oil level and viscosity are used, as this directly impacts shock performance and ride quality.
  3. Carefully install the air spring components and reassemble the damper cartridge, ensuring all parts are snug and secure.

Step 7: Reassemble the Shock

  1. Carefully reassemble the shock by replacing the end caps, ensuring the seals are properly seated.
  2. Tighten all bolts and screws to the manufacturer’s recommended torque settings. Use a torque wrench [paid link] to ensure accuracy.
  3. Reattach the shock to your bike frame by securing it with the appropriate bolts.

Adjusting and Setting Up the TTX2Air Rear Shock

Step 8: Set the Air Pressure

  1. Use a shock pump to adjust the air pressure in the shock’s air spring chamber. The recommended pressure will vary depending on your weight, riding style, and shock settings.
  2. Start with the manufacturer’s baseline pressure and adjust it according to your needs. Ensure that the shock is fully inflated and free from leaks before proceeding.

Step 9: Set the Rebound and Compression Damping

  1. Adjust the rebound and compression damping to your preferred settings. Start by setting the rebound to a medium level, then fine-tune it based on your riding preferences.
  2. For compression damping, adjust it to match your suspension goals. Softer compression is typically preferred for smoother trails, while firmer settings are better for aggressive riding or rougher terrain.

Step 10: Check for Leaks

  1. Before heading out on a ride, check your shock for any signs of air leaks. This can be done by applying soapy water around the shock’s seals and looking for bubbles.
  2. If any leaks are detected, re-tighten the components and inspect the seals for proper installation.

Troubleshooting Common Issues

Air Leaks

  • If your TTX2Air rear shock loses air pressure, inspect the seals, valve, and air chamber for leaks. Damaged O-rings or worn-out seals are the most common culprits.
  • Replace the damaged components with fresh seals from your rebuild kit and reassemble the shock properly.

Reduced Damping Performance

  • If the shock feels less responsive or the damping seems weak, it may be due to insufficient shock fluid or air pressure. Check the oil level and adjust the air pressure accordingly.
  • If the fluid is contaminated, perform a full rebuild and replace the old fluid with fresh, manufacturer-recommended oil.

Noisy Shock

  • A noisy shock could be a sign of debris in the seals or air spring. Clean and lubricate the seals before reassembly.
  • If the noise persists, check for worn-out bushings or damaged parts that may need replacing.

Customization and Optimization

To further optimize your TTX2Air rear shock, consider experimenting with different spring rates, air pressures, and damping settings. Adjusting the rebound and compression settings based on your riding style and terrain type can make a noticeable difference in the overall ride quality. Fine-tuning these settings can help you achieve better control, comfort, and performance, especially on rough terrain or aggressive riding conditions.

Compatibility with Other Drivetrain Components

The TTX2Air rear shock is designed to work seamlessly with other Öhlins components. However, if you plan to pair it with other brands or non-Öhlins suspension components, be sure to check the compatibility regarding shock mount dimensions, air pressure ranges, and suspension kinematics. It’s essential to ensure that the rear shock integrates well with your bike’s frame and drivetrain system for optimal performance and ride quality.

By following this guide and regularly maintaining your TTX2Air rear shock, you can extend its lifespan, ensure smoother rides, and enhance overall bike performance.