The RockShox SID Select+ is a high-performance cross-country suspension fork designed for riders who demand precision and efficiency. To ensure optimal performance, regular maintenance such as an oil change is crucial. Over time, fork oil degrades due to heat, dirt, and moisture, reducing the fork’s responsiveness and protection. This guide provides a step-by-step approach for performing a complete lower leg oil change on the SID Select+, enhancing both its longevity and ride quality.
Tools Required
- 2.5mm and 5mm hex wrenches
- Torque wrench [paid link] with hex bits
- Suspension oil (RockShox 0W-30 and 15W or as specified by the manufacturer)
- Suspension grease (e.g., SRAM Butter)
- Clean rags and isopropyl alcohol
- Rubber mallet
- Oil catch basin
- Syringe or fork oil volume measuring cup
- Safety gloves and glasses
- Snap ring pliers (if performing deeper service)
Preparation and Safety
Before beginning, ensure the bike is clean and the workspace is organized. Dirt or contamination during an oil change can lead to poor suspension performance or internal damage. Secure the bike on a work stand with the front wheel removed. Release all air pressure from the fork using the Schrader valve on the top of the non-drive leg. Always wear gloves and safety glasses to protect against oil splash or debris.
Removing the Lower Legs
The first step involves detaching the lower legs from the fork’s uppers:
Start by using a 2.5mm hex wrench to remove the rebound knob from the bottom of the fork’s non-drive side. Then, use a 5mm hex wrench to loosen—but not remove—the bolts on both fork legs. These bolts hold the lower legs in place. Gently tap the bolts with a rubber mallet to disengage the shaft ends inside the legs. Once disengaged, completely remove the bolts and allow the lower legs to slide off. Be cautious as old oil will drain out.
Cleaning and Inspection
Use isopropyl alcohol and a clean rag to thoroughly clean the inside of the lower legs. Inspect the foam rings and dust wipers for wear or contamination. If the foam rings appear dry or dirty, remove them, soak them in fresh suspension oil, and reinstall. Worn or cracked dust wipers should be replaced to maintain proper sealing and oil retention.
Carefully inspect the stanchions for scratches or blemishes. Any damage could lead to oil leaks or internal wear and should be addressed before reassembly.
Replenishing the Oil
With the lower legs removed and clean, it’s time to refill the fork with fresh oil. The RockShox SID Select+ typically requires:
- 10ml of 15W oil in each lower leg (bath oil)
- Light grease (e.g., SRAM Butter) on the foam rings and dust wipers
Lightly grease the dust wipers and foam rings before sliding the lower legs back onto the stanchions. Insert the lower legs carefully to avoid damaging the seals. As the legs near the bolt holes, pause and inject the correct amount of 15W oil into each leg through the bottom openings.
Reassembling the Fork
Once oil has been added, reinstall the bolts on each leg using a torque wrench [paid link]. Torque them to the manufacturer’s specification (typically around 7.3 Nm). Reattach the rebound knob using the 2.5mm hex wrench. Inflate the fork to your desired air pressure using a shock pump and check for leaks or abnormal noises by compressing the fork several times.
Post-Service Testing
After reassembly, test the fork thoroughly. Bounce the front end of the bike to ensure smooth compression and rebound. Check the rebound adjuster for proper functionality and ensure there’s no oil seepage around the wipers or bolt areas. A quick test ride over uneven terrain will help confirm successful servicing.
Troubleshooting Common Set-Up Issues
Oil Leaks After Service
If oil leaks occur post-service, double-check that the dust wipers and foam rings are seated correctly. Also verify that the lower leg bolts are torqued properly. Using the wrong oil weight or overfilling can also cause leaks.
Harsh or Inconsistent Travel
Improper oil levels or dry foam rings may lead to harsh compression. Ensure you used the correct oil type and amount. Stiction may also be caused by inadequate lubrication on the dust wipers or wear on the bushings.
Rebound Adjuster Not Functioning
This typically results from improper reinstallation or a missing internal circlip. Ensure the rebound knob is securely attached and that the internal adjuster shaft is aligned correctly.
Customization and Optimization
Advanced riders often tailor their fork’s oil weight to personal preferences. Heavier oils provide slower damping and may improve small bump compliance for heavier riders or aggressive descents. Conversely, lighter oils offer a more responsive ride for technical cross-country terrain. Adjustments should be made cautiously, and only in increments of 2.5wt.
Installing volume spacers can also modify the fork’s air spring curve, offering more progression toward the end of the travel. This is particularly beneficial for riders seeking to prevent bottom-out on big hits.
Compatibility with Other Drivetrain Components
The RockShox SID Select+ is designed around modern XC and trail bikes with tapered steerer tubes and Boost 110mm hub spacing. It is compatible with both SRAM and Shimano drivetrains, provided the front axle, crown race, and brake caliper mounts align with frame standards. Always ensure the brake rotor size falls within the fork’s recommended range.
Comparison with Similar Models
Compared to the SID Ultimate, the SID Select+ shares the same chassis but forgoes the Ultimate’s lighter damper and premium finish. Riders looking for the best value in performance often favor the Select+ for its top-tier feel without the price premium. Against competitors like the Fox 32 Step-Cast, the SID Select+ offers stiffer lower legs and improved small bump sensitivity, making it a strong contender for racers and endurance riders alike.
FAQs
How often should I change the oil in my SID Select+ fork?
RockShox recommends lower leg service every 50 hours of riding or sooner in wet/muddy conditions.
Can I use a different oil brand than RockShox?
Yes, but ensure the oil matches the specified weight and performance characteristics of RockShox 0W-30 or 15W.
What’s the difference between bath oil and damper oil in the SID Select+?
Bath oil lubricates the seals and bushings in the lower legs. Damper oil, used inside the damper cartridge, controls the fork’s compression and rebound. This guide covers only the bath oil.
Is it necessary to remove the damper for an oil change?
No. For a routine lower leg service, the damper and air spring remain in place.
Why is my fork noisy after servicing?
Air trapped in the oil or improperly torqued bolts can cause noise. Allow the fork to cycle a few times to remove air bubbles.
Can I upgrade my SID Select+ with parts from the SID Ultimate?
Yes, parts like the Charger Race Day damper and carbon crown may be retrofitted, but compatibility should be confirmed for your specific model year.
Conclusion
Performing an oil change on the RockShox SID Select+ is a straightforward task that can significantly enhance your bike’s performance and longevity. By following the correct procedure and using the recommended products, riders can ensure their fork remains responsive and reliable for every trail ahead. Regular maintenance not only saves money in the long run but also preserves the fork’s premium feel ride after ride.