How to Rebuild Your Super Deluxe Ultimate RCT Rear Shock at Home

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The RockShox Super Deluxe Ultimate RCT rear shock is a highly regarded component, known for its superior performance, adjustability, and durability in off-road and mountain biking. Over time, like all suspension components, it may require maintenance or a full rebuild to maintain optimal performance. Rebuilding the Super Deluxe Ultimate RCT rear shock at home is a rewarding process that can extend the life of your shock and ensure you get the most out of your ride. This guide will provide you with a step-by-step process for rebuilding your Super Deluxe Ultimate RCT rear shock, covering installation, maintenance, troubleshooting, and compatibility.

Tools Required

  • Shock pump
  • Socket wrench set
  • Torque wrench [paid link]
  • Allen wrench [paid link] set
  • Clean rags
  • RockShox Rebuild Kit (includes oil, seals, and necessary components)
  • Small brush (for cleaning)
  • Fork fluid syringe (for precise oil measurements)
  • Suspension grease
  • Seal press tool

Disassembly of the Shock

Before starting the rebuild process, it’s essential to disassemble the shock properly. This will allow you to inspect all components and replace any worn-out parts.

  1. Remove the Shock from the Bike: Start by removing the rear shock from your bike. Use the appropriate wrenches or Allen keys [paid link] to remove the mounting bolts that attach the shock to the frame. Keep these bolts safe as you’ll need them for reinstallation.
  2. Release Air Pressure: Before removing the shock’s air canister, ensure that the air pressure inside is fully released. Use a shock pump to release the air from the air chamber.
  3. Disassemble the Air Canister: Using a socket wrench, carefully loosen and remove the air canister from the main body of the shock. Be cautious not to damage the threads. Once the canister is off, set it aside.
  4. Remove the Piston Assembly: After removing the air canister, the next step is to take out the piston assembly from the shock body. Gently pull the piston rod and slide it out. Make sure to inspect the condition of the piston and seals during this process.
  5. Clean the Components: Use a clean rag and a small brush to remove dirt, grime, and old oil from all components. It is crucial to keep the parts clean to ensure smooth performance once the shock is rebuilt.

Inspection of Internal Components

Before proceeding with reassembly, it’s essential to inspect all internal components for signs of wear or damage.

  1. Check the Shock Body: Inspect the shock body for any damage or wear. Look for scratches, dents, or other signs of fatigue. If the body appears damaged, it may require professional attention or replacement.
  2. Examine the Seals: The seals are vital to keeping dirt and moisture out of the shock’s internals. Check for any cracks, tears, or excessive wear on the seals. If any seals are compromised, replace them immediately.
  3. Inspect the Piston Assembly: The piston assembly should also be checked for signs of wear. If the piston or its components show damage, consider replacing it with a new one from your RockShox rebuild kit.
  4. Check for Oil Leakage: Any oil leakage is a clear sign that the shock has not been functioning optimally. Examine the shock body and air canister for oil residue. If oil leakage is present, ensure that all seals and O-rings are intact.

Rebuilding the Shock

With the components cleaned and inspected, it’s time to begin the rebuild process.

  1. Install New Seals: Apply suspension grease to the new seals provided in the rebuild kit. Carefully install the new seals into their respective positions. It’s essential to press them in gently using a seal press tool to avoid damaging the seals.
  2. Reinstall the Piston Assembly: Once the seals are in place, reinstall the piston assembly into the shock body. Ensure that the piston is seated correctly, and there are no air pockets within the assembly.
  3. Apply Oil: Use the suspension oil from your rebuild kit to fill the shock body. Use the fork fluid syringe to measure the appropriate amount of oil, as too much or too little oil can affect the shock’s performance. Consult the Super Deluxe Ultimate RCT manual for the recommended oil volume and type. Pour the oil slowly to avoid air bubbles.
  4. Reinstall the Air Canister: Once the piston and oil are correctly installed, reinstall the air canister. Make sure the canister threads are clean and properly lubricated before tightening it back onto the shock body. Tighten it to the manufacturer’s recommended torque setting.

Reassembly and Installation

After rebuilding the shock, it’s time to reassemble and reinstall it onto your bike.

  1. Check Air Pressure: Before reinstalling the shock on your bike, check the air pressure using a shock pump. Ensure that the pressure matches your riding style and body weight. The Super Deluxe Ultimate RCT allows for a custom setup, so adjust the air pressure according to your preferences.
  2. Reinstall the Shock: Position the shock back onto your bike’s frame, ensuring that it’s aligned correctly. Tighten the mounting bolts to the recommended torque specification. Double-check that the shock is securely mounted.
  3. Recheck Air Pressure: Once the shock is reinstalled, it’s a good idea to recheck the air pressure once again to ensure it hasn’t changed during the reinstallation process.
  4. Test the Shock: Before heading out for a ride, test the shock by pushing down on the rear end of your bike to check for responsiveness. Ensure that the shock’s compression and rebound settings are functioning properly.

Troubleshooting Common Set-Up Issues

  1. Shock Feels Too Stiff or Too Soft: If the shock feels too stiff or too soft after rebuilding, adjust the air pressure or the compression damping. A shock that feels too stiff may need lower air pressure, while one that feels too soft might require a higher air pressure.
  2. Loss of Rebound Control: If the rebound is not functioning correctly, ensure the rebound damper is properly seated and that the oil levels are correct. Low oil levels can lead to insufficient rebound control.
  3. Oil Leakage: If you notice oil leakage after rebuilding the shock, inspect the seals for proper installation. Make sure that they are seated correctly and that no debris is preventing a proper seal.
  4. Air Pressure Fluctuations: If the air pressure fluctuates despite having properly sealed the shock, there may be an issue with the valve core or the air canister itself. It is best to contact a professional technician if the issue persists.

Customization and Optimization

The Super Deluxe Ultimate RCT rear shock is highly customizable, allowing riders to fine-tune the shock’s performance to suit their riding style. Here are a few tips for optimization:

  1. Adjust Compression Damping: The compression damping controls how quickly the shock compresses under load. Adjust it based on your preferences. For downhill riders, a stiffer compression setting might work best, while cross-country riders may prefer a softer setting.
  2. Rebound Adjustment: The rebound damping determines how quickly the shock returns to its normal position after compression. If you find that the shock rebounds too quickly or too slowly, adjust the rebound settings accordingly.
  3. Air Pressure: Adjust the air pressure to match your weight and riding style. Riders who prefer a firmer, more responsive feel should increase air pressure, while those seeking more comfort and cushion may opt for lower air pressure.

Compatibility with Other Drivetrain Components

The Super Deluxe Ultimate RCT rear shock is compatible with a wide range of mountain bike frames and components. However, it’s essential to ensure compatibility with other drivetrain parts such as the linkage and rear triangle. Always check the manufacturer’s specifications for recommended frame and shock compatibility before proceeding with installation.

Conclusion

Rebuilding your Super Deluxe Ultimate RCT rear shock at home is a manageable and rewarding task. By following this step-by-step guide, you can extend the lifespan of your shock, maintain optimal performance, and fine-tune the suspension to meet your riding needs. Regular maintenance and proper care will ensure that your rear shock continues to provide the smooth, controlled ride that RockShox is known for.