Step-by-Step Rear Shock Oil Change for Super Deluxe Ultimate RCT

The RockShox Super Deluxe Ultimate RCT rear shock is a high-performance component designed for enduro and downhill bikes. Maintaining your rear shock, particularly through regular oil changes, is essential for keeping it in optimal condition. Performing an oil change not only enhances shock performance but also prolongs its lifespan. In this guide, we will walk you through the step-by-step process of performing an oil change on the Super Deluxe Ultimate RCT rear shock. We will also cover key tips for troubleshooting, customization, and ensuring compatibility with other components.

Tools Required

  • Shock pump
  • T25 Torx wrench [paid link]
  • 5mm Allen wrench [paid link]
  • Oil syringe
  • Suspension fluid (recommended by RockShox for your model)
  • Rubber gloves
  • Cleaning materials (rags, brushes, etc.)
  • Torque wrench [paid link]
  • Plastic container for draining oil
  • Needle nose pliers
  • Service manual for Super Deluxe Ultimate RCT

Preparing for the Oil Change

Before you begin, ensure your bike is on a stable stand, and the rear shock is fully deflated. It is important to follow the proper steps to release all pressure in the shock before disassembling it. Remove the rear shock from the frame to allow easy access to the components you’ll be working with.

1. Deflate the Shock

Using a shock pump, release the air pressure from the rear shock to ensure you can safely remove the damper. Check the valve stem and ensure no residual pressure remains.

2. Remove the Rear Shock from the Bike

To remove the shock from the bike frame, use a 5mm Allen wrench [paid link] to unscrew the bolts securing the shock to the frame and rear triangle. Ensure that the shock is safely detached before proceeding.

3. Clean the Shock Assembly

Before performing any maintenance, thoroughly clean the exterior of the shock. Use a rag or soft brush to remove dirt, mud, and grime. Be cautious not to push dirt into the shock’s seals.

Disassembling the Shock

The next step is to disassemble the shock to access the oil chamber. This involves removing the shock’s air can and reservoir to drain the old oil.

1. Remove the Air Can

Using a T25 Torx wrench [paid link], carefully unscrew the air can’s screws. Depending on the design of the Super Deluxe Ultimate RCT, the air can may need to be rotated or gently pried off. Be sure not to damage the air can or internal components during this process.

2. Drain the Old Oil

Once the air can is removed, place the shock in an upright position to allow the oil to drain completely into a container. Be sure to dispose of the oil properly according to local regulations.

3. Inspect the Internal Components

After draining the old oil, inspect the shock’s internal parts, including the piston and seals, for any wear or damage. Pay special attention to the shock shaft and seals as these can affect performance if worn out.

Refilling with Fresh Oil

After you have drained the old oil and inspected the components, it’s time to refill the shock with fresh suspension fluid.

1. Prepare the New Oil

Using the recommended RockShox suspension fluid for your Super Deluxe Ultimate RCT, prepare the correct amount of oil. Depending on the volume required, use an oil syringe to fill the reservoir. Follow the specific oil capacities outlined in the service manual to avoid overfilling.

2. Fill the Shock with Fresh Oil

Slowly and carefully inject the fresh oil into the oil reservoir. Be sure not to introduce air into the system during this process. Overfilling the shock can affect its performance, so ensure the oil level is correct by checking the service manual.

3. Reinstall the Air Can

Once the oil has been filled to the correct level, carefully reinstall the air can. Rotate it back into position and secure it with the T25 Torx screws. Ensure that the screws are tightened to the recommended torque specification to avoid damaging the shock.

Reassembly and Testing

With the oil change complete, reassemble the shock and reinstall it on your bike. It’s important to check for any leaks or air pockets in the system before using the shock.

1. Reinstall the Shock on the Bike

Position the shock back onto the bike frame and secure it with the proper bolts. Use a torque wrench [paid link] to ensure the bolts are tightened to the correct specifications. It is important to avoid overtightening, as this can cause damage to the frame or shock mounts.

2. Inflate the Shock to the Correct Pressure

Using a shock pump, reinflate the shock to the recommended air pressure based on your rider weight and suspension setup. Adjust the pressure accordingly to achieve the desired sag.

3. Perform a Basic Test

Before taking the bike on a ride, perform a basic compression and rebound test by pressing down on the saddle and checking the shock’s response. If the shock feels too soft or too stiff, you may need to make minor adjustments to the pressure or damping settings.

Troubleshooting Common Set-Up Issues

After performing the oil change, if the rear shock isn’t performing as expected, consider these common issues:

  • Lack of rebound control: If the shock doesn’t return properly, check the rebound adjustment knob. If it still isn’t functioning after adjusting, the damping oil might be insufficient or improperly filled.
  • Poor compression performance: If the shock feels harsh or bottoming out, check the air pressure and oil levels. Low oil or incorrect oil types can cause compression issues.
  • Leaks around the seals: Inspect the seals for wear. If the seals are damaged or cracked, oil can leak, which will affect performance. Replacing the seals is necessary for smooth operation.

Customization and Optimization

For better performance, consider customizing your Super Deluxe Ultimate RCT to match your riding style and terrain. Adjustments to the air pressure, rebound, and compression settings can provide more control on different trails. RockShox offers tunable components such as air volume spacers and shock tunes that can be added or swapped to enhance performance.

Compatibility with Other Drivetrain Components

The Super Deluxe Ultimate RCT rear shock is part of a complete suspension system that works best when paired with compatible components. Ensure that your bike frame, rear triangle, and other suspension parts are compatible with this model. This rear shock is commonly used in conjunction with advanced mountain bike drivetrains, but always verify compatibility with your specific bike model before installation.