The Öhlins TXC2Air [paid link] rear shock is a premium, high-performance suspension component designed for off-road and mountain biking. Regular maintenance, including oil changes, ensures that the shock performs optimally, providing better handling, comfort, and durability. In this guide, we will walk you through the essential steps to perform an oil change on the TXC2Air [paid link] rear shock. This process requires technical knowledge and the right tools, so make sure to follow the instructions carefully to maintain your shock’s performance and longevity.

Tools Required

• 10mm socket wrench
• T25 Torx driver
• 5mm Allen wrench [paid link]
• Shock pump
• Ohlins oil (specific to TXC2Air model)
• Torque wrench [paid link]
• Clean work surface (preferably a clean cloth or workbench)
• Rags for cleaning
• Oil drain pan or container
• Small syringe (for precise oil filling)
• Protective gloves
• Safety glasses
• 4mm Allen wrench [paid link]
• Needle nose pliers (for seal removal)

Preparation Before Starting the Oil Change

Before starting the oil change, ensure that you have a clean and organized workspace. It’s critical to maintain cleanliness when working with the internal components of your rear shock to avoid introducing dirt and debris. Have all your tools ready and make sure the shock is completely disassembled and not attached to the bike.

Step 1: Remove the Rear Shock from the Bike

1. Begin by removing the rear shock from the bike. Use a 5mm Allen wrench to detach the shock from both the upper and lower mounting points. This will require removing the bolts that secure the shock to the frame.
2. Set the shock aside on a clean surface, ensuring it is placed upright to prevent oil spillage.

Step 2: Release Air from the Shock

Before disassembling the shock, it is crucial to release the air pressure. Use a shock pump to remove any air from the air spring chamber. This will ensure that no residual pressure remains, which could potentially cause damage or injury when disassembling the shock.

Step 3: Disassemble the Shock

1. Use a 10mm socket wrench to remove the shock’s top cap. This is typically secured tightly, so it may require some force to loosen.
2. After removing the top cap, carefully pull the shaft out of the body. At this point, you should be able to see the damper assembly and the oil reservoir inside the shock.

Step 4: Drain the Old Oil

1. Position the shock over an oil drain pan or container to collect the old oil.
2. Use a small syringe to carefully extract the oil from the reservoir. Slowly drain all the oil from the shock to ensure that no residual oil remains inside.
3. Wipe the inside of the shock body with a clean rag to remove any leftover oil and dirt.

Step 5: Inspect and Clean Internal Components

Once the shock is drained of oil, it’s essential to inspect the internal components for any wear or damage. Check the damper rod, seals, and bushings for any signs of wear. If any parts are damaged, replace them with new Öhlins parts to ensure optimal shock performance.

1. Use needle nose pliers to carefully remove the old seals and gaskets if needed.
2. Clean all the parts thoroughly with a clean rag and check for any dirt or debris that may have accumulated. Ensuring everything is clean and free of contaminants is vital for the shock’s performance.

Step 6: Reassemble the Shock

1. Once the internal components are cleaned, insert the damper rod back into the shock body carefully.
2. Install the new seals and gaskets. Make sure they are seated correctly and securely in their respective places to avoid air or oil leaks.
3. Replace the top cap on the shock, making sure it is tightly screwed in place. Use a torque wrench [paid link] to tighten it to the manufacturer’s recommended torque specifications (typically around 8-10 Nm).

Step 7: Refill the Shock with Oil

1. Use the appropriate Öhlins oil for the TXC2Air model. Ensure that you have the correct oil type and volume required for your shock.
2. Use a syringe to carefully fill the shock with fresh oil. Slowly add the oil to the reservoir until it reaches the recommended oil level.
3. Once the oil is filled, slowly compress and decompress the shock a few times to allow the oil to circulate within the damper.

Step 8: Check the Oil Level

After the shock has been cycled, check the oil level again to ensure it’s at the correct level. Add more oil if necessary to reach the recommended level. This is critical for maintaining the shock’s damping performance and overall function.

Step 9: Reinstall the Shock on the Bike

1. Once the oil change is complete and the shock is reassembled, carefully reinstall the shock onto the bike.
2. Use the 5mm Allen wrench to secure the shock back onto the frame at both the upper and lower mounting points.
3. Tighten the mounting bolts to the manufacturer’s recommended torque specification.

Step 10: Reinflate the Air Spring

Using a shock pump, inflate the air spring to the correct pressure according to the rider’s weight and riding preferences. Double-check the air pressure after inflating to ensure it is set properly.

Troubleshooting Common Issues

During the oil change process, you might encounter a few common issues. Here’s how to troubleshoot them:

1. Oil Leaks: If the shock is leaking oil after the service, it could be due to improper seal installation or damage to the seals. Double-check the seals and gaskets for proper installation and condition.
2. Air Pressure Problems: If the air pressure is not holding after inflation, check for air leaks in the air spring chamber or the valve stem. A damaged valve could require replacement.
3. Poor Damping Performance: If the shock feels too soft or too stiff, it may indicate an issue with the oil level or the shock’s internal components. Ensure the oil level is correct and that all internal parts are in good condition.

Customization and Optimization for Better Performance

The TXC2Air rear shock offers a range of adjustments to fine-tune the performance. Here are a few ways you can optimize the shock after performing an oil change:

1. Rebound and Compression Settings: Adjust the rebound and compression damping settings according to your riding style and terrain. Softer compression settings will allow for better absorption of rough terrain, while firmer settings are ideal for more aggressive riding.
2. Air Spring Pressure: Adjusting the air spring pressure allows you to tailor the shock’s performance to your weight and riding style. Lighter riders should use lower pressure, while heavier riders will require more pressure for optimal support.
3. Damper Oil: Using different grades of damper oil can change the overall performance. Heavier oils offer more damping, while lighter oils provide a faster response.

Comparison with Similar Models

While the TXC2Air is an excellent choice for serious riders looking for a high-performance shock, you may be wondering how it compares to other similar models, such as the FOX Float X2 or RockShox Super Deluxe.

• FOX Float X2: The FOX Float X2 is known for its consistency and adjustability, particularly in the low-speed compression settings. However, it is generally heavier than the TXC2Air, which offers a more lightweight solution without compromising performance.
• RockShox Super Deluxe: The RockShox Super Deluxe offers a more budget-friendly option compared to the TXC2Air but lacks the same level of adjustability and fine-tuning options. Riders who prioritize precision and high-level performance may prefer the TXC2Air for its customizable features.

Compatibility with Other Drivetrain Components

The TXC2Air rear shock is compatible with most modern mountain bike drivetrains, including those from Shimano, SRAM, and Campagnolo. However, it’s important to ensure that your bike’s frame and geometry are compatible with the shock. The shock should fit snugly within the frame’s rear triangle, and the mounting hardware must match the shock’s eyelet dimensions. Always consult your bike manufacturer’s specifications to ensure compatibility before installation.