Öhlins is renowned for producing high-performance suspension components, and the TTX22M Trunnion [paid link] rear shock is no exception. This shock is designed to provide superior comfort and control for mountain bikers who demand the best from their equipment. Servicing your TTX22M Trunnion [paid link] rear shock may seem intimidating, but with the right tools and knowledge, you can perform maintenance tasks yourself, saving time and money while ensuring optimal performance.
Tools Required
- 3mm, 5mm, and 8mm Allen wrenches [paid link]
- Torque wrench [paid link] (0-20Nm range)
- Soft mallet or rubber hammer
- Suspension fluid (Öhlins recommended oil)
- Silicone grease
- Clean rags or paper towels
- A small bucket for oil
- Shock pump
- C-clip tool (optional)
- TTX22M service kit (including seals and O-rings)
- 10mm open-ended wrench
Overview of the TTX22M Trunnion Rear Shock
The TTX22M Trunnion rear shock is designed for high-performance suspension in advanced mountain biking. It features a trunnion mount, which provides a stiffer interface with the frame, improving shock control. The shock uses Öhlins’ TTX technology, which consists of a twin-tube design for enhanced damping performance. This design allows for smoother compression and rebound adjustments, giving the rider greater control on both technical descents and climbs.
Regular maintenance is essential to ensure the longevity and performance of your shock. While many riders opt to take their shocks to a mechanic, servicing the TTX22M Trunnion rear shock yourself is entirely possible with the right tools and a careful approach.
Disassembling the TTX22M Trunnion Rear Shock
Before you begin, ensure that you have a clean and stable workspace. Dirt and debris can easily damage internal components if introduced during the disassembly process.
Step 1: Remove the Shock from the Bike Frame
- Begin by removing the shock from your bike frame. Using a 5mm Allen wrench [paid link], unscrew the bolts securing the shock to the frame.
- Make sure to keep the hardware and washers in a safe location so you can reassemble the shock correctly.
- Once the bolts are removed, carefully take the shock out of the frame.
Step 2: Remove the Trunnion Mounting Hardware
- With the shock removed, use a 3mm Allen wrench [paid link] to remove any screws or bolts securing the trunnion mount. Keep the hardware safe for reassembly later.
Step 3: Remove the Shock Eyelet and C-clip
- Use a soft mallet or rubber hammer to gently tap the eyelet and C-clip off the shock shaft. Be careful not to damage any components during this process.
Cleaning the TTX22M Trunnion Rear Shock
Once the shock is disassembled, it is crucial to clean the parts thoroughly before performing any maintenance.
Step 1: Clean the Exterior
- Use a clean rag or paper towels to wipe down the exterior of the shock body. Make sure to remove any dirt, grime, or oil that has accumulated on the surface.
Step 2: Flush the Internal Components
- To flush out old oil and contaminants from the shock, you can use a suspension fluid compatible with Öhlins products. Carefully pour the suspension fluid into the shock body and gently compress the shock to ensure the fluid flows through all internal components.
- Drain the fluid from the shock by removing any drainage plugs. Dispose of the used oil properly.
Servicing the Shock Internals
Step 1: Inspect the Internal Components
- Carefully inspect the piston, damper, and seal head for any signs of wear or damage. If you notice any damaged or worn parts, replace them using the parts provided in the TTX22M service kit.
Step 2: Replace the Seals and O-Rings
- Remove the seals and O-rings from the shock components using a C-clip tool or small flathead screwdriver.
- Carefully install new seals and O-rings from the TTX22M service kit. Be sure to lubricate the seals with suspension fluid or silicone grease to ensure proper function and prevent leakage.
Step 3: Reassemble the Damper Components
- Once the seals and O-rings have been replaced, begin reassembling the damper components in reverse order. Take care to ensure everything is aligned and properly seated.
Rebuilding and Filling the Shock with Oil
Step 1: Reassemble the Shock Components
- Begin by reinstalling the piston and damper assembly into the shock body.
- Use a soft mallet or rubber hammer to gently tap the components into place, ensuring there is no misalignment.
Step 2: Fill the Shock with Suspension Fluid
- With the damper assembly in place, fill the shock with the recommended Öhlins suspension fluid. Ensure that the fluid level is correct according to the specifications in the TTX22M manual.
Step 3: Bleed the Shock
- After filling the shock, carefully bleed the air out of the shock body using a shock pump. This will ensure that the shock is properly pressurized and that no air bubbles remain in the system.
Reinstalling the Shock on the Bike
Step 1: Attach the Shock to the Frame
- With the shock fully serviced, carefully reinstall it onto the bike frame.
- Secure the shock using the mounting hardware and torque the bolts to the manufacturer’s recommended specifications (usually 8-10Nm for trunnion mount).
Step 2: Adjust the Shock Pressure
- Using a shock pump, adjust the air pressure in the shock according to your rider weight and riding style. Check the owner’s manual for the recommended pressures for optimal performance.
Step 3: Test the Shock
- Before heading out on a ride, compress and extend the shock a few times by hand to ensure everything is working smoothly. Check for any signs of oil leakage or unusual noises.
- Once satisfied with the shock’s performance, go for a test ride to confirm everything is functioning as expected.
Troubleshooting Common Issues
Shock Not Holding Air
If your shock is not holding air, it could be due to a worn seal or O-ring. Inspect these components carefully and replace them if necessary.
Unresponsive Compression or Rebound
If the shock feels unresponsive during compression or rebound, it could be due to a buildup of debris or a lack of fluid in the damper. Perform a thorough cleaning and refill the shock with fresh suspension fluid.
Noisy Shock
Noises coming from the shock could indicate improper lubrication or worn seals. Check that the seals are adequately lubricated with silicone grease and ensure all components are properly seated.
Customization and Optimization
Adjusting the Damping Settings
The TTX22M Trunnion rear shock features adjustable compression and rebound settings. Fine-tuning these settings to your riding style and terrain can significantly improve performance. Experiment with different settings to find the optimal balance between comfort and control.
Fine-Tuning the Air Pressure
Adjusting the air pressure in your shock based on rider weight and riding conditions is essential for achieving the best performance. Lower air pressures generally provide more plushness and comfort, while higher pressures are better for more aggressive riders who need stiffer support.
Comparing the TTX22M with Other Öhlins Shocks
The TTX22M Trunnion rear shock stands out with its TTX twin-tube design, which offers excellent control and performance. When compared to other Öhlins models, such as the STX22 or the RXF36, the TTX22M offers a more refined and precise damping experience. The choice between these models will depend on your specific needs, including riding style and terrain.
Compatibility with Other Drivetrain Components
The TTX22M Trunnion rear shock is compatible with a variety of mountain bike frames, particularly those designed for trunnion mounting. Ensure that your frame is compatible with the shock’s dimensions and mounting system before installation. Additionally, pairing the shock with a compatible fork and drivetrain will help ensure the best overall performance.
By following these steps and properly maintaining your TTX22M Trunnion rear shock, you can enjoy a smoother, more controlled ride, all while saving on service costs and extending the lifespan of your suspension components.