The RockShox SID Ultimate 3P suspension fork is a premier cross-country fork, offering lightweight construction and the innovative 3P remote system that allows three distinct ride modes—Open, Pedal, and Lock. For riders looking to optimize their suspension performance, correct setup and tuning are essential. This guide covers all necessary aspects of installing, adjusting, maintaining, and customizing the SID Ultimate 3P to deliver the best possible ride experience.
Tools Required
- Torque wrench [paid link] with appropriate hex and Torx bits
- Suspension pump (for air pressure adjustment)
- Shock oil and syringe (for lower leg service)
- Isopropyl alcohol and clean rags
- Allen keys [paid link] (various sizes)
- Crown race setting tool (for new installations)
- 3P remote lever and cable kit (if not pre-installed)
Installation of the SID Ultimate 3P
Installing the SID Ultimate 3P involves precise steps to ensure safe operation and integration with the remote lockout system.
Begin by cutting the steerer tube to match the frame’s headtube and headset stack height. Fit the crown race using the proper setting tool, ensuring a flush fit on the fork’s crown. Insert the fork into the headtube, align spacers and stem, then torque the top cap and stem bolts to specification.
The 3P remote installation includes routing the cable to the fork’s damper side, terminating it into the lockout actuator. Proper cable tension is crucial—too loose, and the Lock mode won’t engage; too tight, and the Open mode might be restricted. Use the barrel adjuster to fine-tune cable tension so that the three positions snap cleanly with lever input.
Initial Suspension Setup
RockShox provides a recommended air pressure chart based on rider weight, which is a helpful starting point. Inflate the fork to the desired pressure using a suspension pump, ensuring to equalize positive and negative air chambers by cycling the fork after pressurizing.
Set sag to approximately 15–20% for cross-country use. Measure sag by sitting on the bike in riding gear and noting the position of the rubber O-ring on the stanchion. Adjust air pressure until the sag indicator aligns with this range.
Rebound damping can be adjusted via the red dial at the fork’s bottom leg. Start at the midpoint of the dial range and fine-tune by observing how quickly the fork returns after compression. Slower rebound is ideal for control on technical descents, while faster rebound suits smoother trails.
Using the 3P Remote Effectively
The SID Ultimate 3P’s remote system offers instant on-the-fly damping adjustments:
- Open Mode: Maximum compression sensitivity for descending or rough terrain.
- Pedal Mode: Partial compression damping for rolling terrain, improving efficiency while retaining comfort.
- Lock Mode: Near-complete lockout for climbing or sprinting on smooth surfaces.
Each position is selectable via the handlebar-mounted remote, allowing seamless transitions without removing hands from the grips. Riders should experiment with terrain-specific tuning to determine which settings suit their style and conditions.
Regular Maintenance and Lower Leg Service
Regular fork maintenance prolongs lifespan and performance. Clean the stanchions after every ride to remove dust and debris. Inspect for oil seepage or scuff marks that indicate seal wear.
Lower leg service is recommended every 50 hours of riding. This includes removing the fork lowers, cleaning internals, replacing foam rings and wiper seals if necessary, and replenishing lubrication oil. RockShox specifies the type and volume of oil—follow this precisely to maintain performance and warranty eligibility.
Troubleshooting Common Issues
3P Remote Not Shifting Between Modes
This issue typically stems from cable tension problems. Re-adjust the barrel adjuster and check for kinks or frayed cable ends. Also, ensure the remote lever has smooth, uninhibited movement.
Excessive Fork Stiction
Stiction may result from dried lubricant or contaminated seals. Perform a lower leg service and inspect seals. Re-lubricate with specified oils and reassemble carefully.
Bottoming Out Too Easily
If the fork compresses fully too often, increase the air pressure or add Bottomless Tokens to increase progression. These volume spacers alter the air spring curve, making the last part of the travel firmer.
Customization and Performance Tuning
Advanced riders can tailor the SID Ultimate 3P by modifying the air spring volume and experimenting with rebound and compression damping. Installing Bottomless Tokens is a simple process involving unscrewing the air cap and threading the tokens onto the air shaft.
The Charger Race Day damper inside the SID Ultimate 3P offers race-level sensitivity but limited external adjustability. Riders seeking a firmer ride can experiment with damper tuning or opt for a firmer compression tune during service.
Compatibility with Other Drivetrain and Suspension Components
The SID Ultimate 3P is optimized for modern XC frames with tapered steerers and 110mm Boost spacing. It works seamlessly with SRAM remote lockout levers but can be retrofitted with other Matchmaker-compatible remotes if needed.
The fork integrates well with RockShox rear shocks using a dual-lockout remote for simultaneous front and rear control. Cable routing compatibility should be verified for dual setups.
Comparing the SID Ultimate 3P to Other Models
Compared to the standard SID Ultimate or SID Select+, the SID Ultimate 3P stands out with its 3-position remote adjustability and ultra-lightweight Race Day damper. While it lacks extensive compression adjustment, its simplicity and race-ready tuning make it ideal for competitive XC riders.
Trail riders may prefer the Pike Ultimate or SID Select+, which offer more tuning knobs and slightly more robust chassis. However, for those focused on weight savings and efficient control, the 3P remains a top-tier choice.
FAQs
How often should I service my SID Ultimate 3P?
Routine cleaning should be done after every ride. A lower leg service is recommended every 50 hours, and a full damper overhaul every 100–200 hours depending on conditions.
Can I install the SID Ultimate 3P on a non-Boost frame?
No. The fork uses a Boost (110mm) axle standard, which is incompatible with older non-Boost frames and wheels.
Does the SID Ultimate 3P support a dual remote setup for rear shock control?
Yes. It can be integrated with a compatible RockShox rear shock using a dual remote lockout system.
Why is my fork not locking out completely in Lock Mode?
Check the cable tension and ensure there’s no slack. Also, verify that the damper actuator on the fork is returning fully to the lock position.
Can I change the travel on the SID Ultimate 3P?
Travel can be adjusted within the fork’s design limits (typically 100mm to 120mm) by replacing internal air shaft components. This should be done by a qualified technician.
Is it possible to use a different remote lever with this fork?
Yes, as long as the lever is compatible with the 3P damper and has correct pull ratios, such as SRAM’s Matchmaker-compatible remotes.
Conclusion
Tuning the RockShox SID Ultimate 3P suspension fork ensures optimal performance and control for competitive cross-country riders. With proper setup, regular maintenance, and careful tuning of the 3P system, this fork delivers a lightweight yet robust solution for demanding trail conditions. Whether racing or riding for fitness, mastering the SID Ultimate 3P will significantly enhance ride quality and efficiency.