Maintaining the performance and longevity of your RockShox SID SL Ultimate 2P suspension fork requires routine maintenance, precise installation, and proper adjustment. This guide provides expert insight into caring for this high-performance, ultralight XC race fork. Whether you’re installing it for the first time or performing scheduled service, follow this comprehensive guide for optimal results.
Tools Required
- 2.5mm, 5mm, and 6mm hex wrenches
- Torque wrench [paid link] with Nm settings
- Suspension pump
- Clean microfiber cloths
- Suspension-specific grease
- Suspension oil (RockShox 0W-30, 3wt)
- Seal kits and O-ring replacements (RockShox service kits)
- Isopropyl alcohol (90% or higher)
- Pick tool
- Rubber mallet
Initial Setup and Installation
Installing the SID SL Ultimate 2P correctly ensures structural integrity and smooth performance. Begin by confirming steerer tube compatibility with your frame’s headset type—this model features a tapered carbon steerer.
Check that your fork offset and travel length (commonly 100mm for this model) matches your frame geometry. Insert the fork into the headset with appropriate grease on the crown race. Torque the stem bolts and top cap as per RockShox specifications—typically 5.2Nm for stem bolts and 4.6Nm for top cap preload. Ensure the brake mount interface aligns precisely; the SID SL Ultimate 2P uses a direct-mount post design for 160mm rotors without adapters.
After alignment, attach the front wheel and verify axle torque. RockShox Maxle Stealth axle should be torqued to 9.7Nm. Before riding, use a suspension pump to set air pressure according to rider weight using the RockShox tuning chart for the DebonAir spring system.
Routine Maintenance Schedule
Routine care extends the lifespan of internal components. RockShox recommends lower leg service every 50 hours and full damper service every 200 hours.
To perform a 50-hour service:
- Remove the fork from the bike and place it in a work stand.
- Depressurize the air spring fully using a suspension pump.
- Remove lower legs using 2.5mm hex bolts on each leg. Gently tap them with a rubber mallet.
- Drain the old oil and clean inside the lower legs with isopropyl alcohol.
- Install new foam rings and lubricate them with 3wt oil.
- Reinstall lower legs, torque bolts to 7.3Nm, and refill the oil bath with 10ml per leg.
Always check for dust seal wear and bushing play. For best performance, replace seals every 100 hours.
Air Spring and Damper Adjustments
The SID SL Ultimate 2P features the DebonAir air spring and Charger Race Day 2 damper. Adjusting the air spring starts with setting your sag—typically 15-25% for cross-country use. Use sag gradients printed on the stanchions for reference.
For damping, use the two-position remote lockout to toggle between “Open” and “Lock.” The open mode offers plush performance, while the lockout firms the fork for sprints or climbs. There’s no rebound adjuster on this model, simplifying setup but necessitating careful air spring tuning.
Common Troubleshooting Issues
Loss of Travel
If your fork is not achieving full travel, check air pressure first. If pressure is correct, inspect the negative air spring equalization. Manually compress the fork fully to equalize chambers.
Stiction or Harshness
This usually stems from dry or contaminated seals. Perform a 50-hour service and inspect the upper bushings for wear.
Remote Lockout Not Engaging
Ensure cable tension is correct and the remote is free from debris. The remote should fully return when released. If not, service the cable and check the actuator at the fork crown.
Customization and Performance Optimization
To fine-tune ride quality, you can adjust volume tokens within the air spring. Adding tokens increases progression, helping prevent bottom-out on hard impacts. For lighter riders or smoother courses, removing tokens allows for a more linear response.
Additionally, swapping to lighter fork oil or modifying the damper’s shim stack (advanced users only) can tailor rebound behavior. Always follow RockShox service manuals if undertaking internal modifications.
Compatibility Considerations
The SID SL Ultimate 2P is designed for modern XC frames with Boost 110mm axle spacing. It’s compatible with flat-mount and post-mount brake calipers, though the stock configuration supports 160mm rotors directly. For larger rotors, use RockShox-specific adapters.
This fork is optimized for 29-inch wheels with up to 2.4” tire clearance. Check crown clearance carefully when running higher-volume tires. It pairs best with SRAM Eagle drivetrains and RockShox TwistLoc remotes for seamless lockout integration.
Model Comparison and Buyer Insight
When compared to other RockShox models like the SID Select+ or Fox 32 Step-Cast, the SID SL Ultimate 2P stands out for its ultra-light carbon crown and steerer, making it ideal for weight-conscious racers. The Charger Race Day 2 damper, although lacking external rebound control, provides race-tuned performance with minimal fuss.
For riders seeking more adjustability, the Fox 34 SC or SID Ultimate (non-SL) may offer better options with broader damping range and increased stiffness. However, for pure XC race scenarios, the SID SL Ultimate 2P remains a top-tier performer.
FAQs
Q1: How often should I service the SID SL Ultimate 2P?
Every 50 hours for lower leg service and 200 hours for full damper and air spring service.
Q2: Can I add volume spacers to the air spring?
Yes, volume tokens can be added to adjust air spring progression.
Q3: What air pressure should I run?
Refer to RockShox’s tuning chart, but start around 90-110 psi for a 70kg rider.
Q4: My remote lockout is sluggish—what should I do?
Inspect the cable housing and actuator. Lubricate and check for kinks or friction.
Q5: Is the SID SL Ultimate 2P compatible with 27.5” wheels?
No, it is designed specifically for 29” wheels with Boost spacing.
Q6: Can I use a different remote lockout system?
Yes, it’s compatible with any RockShox push-to-lock remote, though TwistLoc is recommended.
Conclusion
The RockShox SID SL Ultimate 2P is a precision-engineered XC race fork built for speed and efficiency. By following proper installation, conducting regular maintenance, and making minor performance tweaks, you’ll keep your fork performing like new for seasons to come. Understanding its specific needs and capabilities ensures maximum return on your investment and a smoother ride on every trail.