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

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The RockShox Super Deluxe Ultimate DH [paid link] rear shock is an essential component for downhill riders, offering both comfort and control during high-impact descents. Regular maintenance is key to maintaining its optimal performance. One of the most important maintenance tasks for this shock is the oil change, which helps to preserve damping performance, prevent internal wear, and ensure a smooth, responsive ride. In this guide, we’ll walk you through the step-by-step process of changing the oil in your Super Deluxe Ultimate DH [paid link] rear shock.

Tools Required

  • 5mm Allen wrench [paid link]
  • 8mm Allen wrench [paid link]
  • 10mm Allen wrench
  • Torque wrench [paid link] (with appropriate range)
  • Suspension fluid (specific to RockShox, like 15wt or 5wt, depending on your preference)
  • Shock pump
  • Clean rags
  • Oil bath tray or a container to collect old oil
  • Socket driver (if needed for specific tasks)
  • T25 Torx wrench [paid link] (for certain fasteners)
  • Oil syringe or small funnel (for refilling the shock)
  • Gloves (to prevent contamination)

Preparation for the Oil Change

Before starting the oil change, ensure that your bike is in a stable position, and the rear shock is not under any load. If necessary, remove the shock from the frame. This step will make it easier to work on the shock and avoid any potential mess during the oil change process. Make sure you have the required suspension fluid ready and are familiar with the shock’s specifications, as using incorrect oil can damage the internals.

Step 1: Remove the Rear Shock

If you haven’t already done so, remove the shock from your bike’s frame. Use the appropriate Allen wrenches [paid link] to remove the mounting bolts at both ends of the shock. Place the shock in a clean, stable area on a workbench, ensuring it won’t be damaged during the oil change process.

Step 2: Remove the Eyelet and Shaft Assembly

To access the oil reservoir, you need to remove the eyelet (the mount that attaches the shock to the frame). Depending on the model, the eyelet might be secured with a retaining bolt or a snap ring. Use your 5mm Allen wrench to remove the eyelet. Once removed, set the eyelet aside in a safe place for reinstallation later.

Next, carefully remove the shaft assembly by loosening the retaining bolts, which may be located near the top of the shock’s body. Keep track of the parts as you disassemble them, as they will need to be reassembled in the reverse order after the oil change.

Step 3: Drain Old Oil

Before refilling the shock, it’s crucial to drain the old oil. Place the shock over an oil bath tray or a container to collect the old fluid. Hold the shock at an angle and gently tap it to ensure that all the oil drains out completely. It is essential to remove all the old oil to avoid contamination with the new fluid.

Step 4: Clean Internal Components

Once the oil is drained, clean all internal parts of the shock, including the shaft assembly, eyelet, and damper body, using clean rags. Be cautious not to damage any seals or o-rings. Use a mild cleaner if necessary, but ensure that the internal components are thoroughly dried afterward. Any contamination in the shock can affect its performance.

Step 5: Reassemble the Shock

With the components cleaned, begin reassembling the shock. First, insert the shaft assembly back into the shock body. Ensure that all parts are properly aligned and that the shaft moves freely inside the body. Replace the retaining bolts securely, but do not overtighten them. Next, reattach the eyelet using the appropriate bolts and torque them to the specified setting to avoid any damage.

Step 6: Refill the Shock with New Oil

Now, it’s time to refill the shock with fresh suspension oil. Use a syringe or small funnel to carefully pour the recommended amount of oil into the shock’s oil reservoir. Be sure to follow the manufacturer’s guidelines for the correct amount and type of oil. This step is crucial for the proper functioning of the shock, as incorrect oil levels can affect its performance.

Step 7: Bleed the Shock (If Necessary)

Some RockShox shocks may require bleeding to remove any trapped air after refilling with oil. To do this, compress the shock a few times to allow the oil to circulate through the system. If your model requires it, follow the manufacturer’s instructions for bleeding the shock. This ensures that there are no air pockets inside the shock, which could lead to inconsistent damping performance.

Step 8: Reinstall the Shock onto the Bike

Once the shock has been properly refilled and bled (if necessary), reinstall it onto your bike frame. Align the eyelet with the mounting points and securely fasten the bolts with the correct torque settings. Double-check that the shock is properly seated and that no bolts are loose.

Step 9: Adjust the Shock Pressure

Before riding, you’ll need to set the correct air pressure in the shock. Use a shock pump to add air to the shock according to your weight and riding style. Check the recommended pressure settings in the RockShox manual or on the shock’s sticker. Proper air pressure ensures that the shock provides the correct level of responsiveness and comfort during rides.

Step 10: Test the Shock

After installation, it’s crucial to test the shock to ensure everything is functioning correctly. Compress and release the shock several times to check for smooth movement. Pay attention to any unusual noises or resistance. If the shock feels inconsistent or sluggish, it may require further attention, such as bleeding again or verifying the oil level.

Troubleshooting Common Set-up Issues

Even after an oil change, you may encounter issues with the performance of your Super Deluxe Ultimate DH rear shock. Here are a few common issues and their solutions:

  • Shock feels too stiff or too soft: This could be a result of improper air pressure or insufficient oil in the shock. Ensure the air pressure is adjusted to your weight and check the oil level.
  • Unusual noises: If you hear knocking or squeaking sounds, the oil might not be properly bled, or dirt may have entered the shock during the maintenance. Check for air bubbles in the oil and clean all parts thoroughly.
  • Uneven damping performance: If one side of the shock feels stiffer than the other, it could be due to an internal air bubble or contamination. Ensure that you’ve bled the shock correctly and that the oil was replaced with fresh fluid.

Customization and Optimization

To optimize the performance of your Super Deluxe Ultimate DH rear shock, consider customizing the oil viscosity based on your specific needs. For downhill racing, thicker oil (such as 15wt) may provide additional damping control, whereas lighter oils (5wt) are often used for smoother, more responsive shock behavior. Additionally, adjusting the rebound and compression settings allows you to fine-tune the shock for your particular riding style, giving you better control over your bike’s performance on varying terrain.

Conclusion

Regular oil changes for your RockShox Super Deluxe Ultimate DH rear shock are critical for maintaining its performance and extending its lifespan. By following this detailed step-by-step guide, you can ensure that your shock remains in top condition, ready to tackle the toughest downhill trails. Always consult the specific RockShox manual for your model to ensure you’re using the correct tools, oils, and torque settings.