The RockShox SID SL Ultimate 2P is a high-performance cross-country suspension fork designed to deliver precise control and minimal weight for elite racing conditions. Regular servicing and fine-tuning are essential to maintain its smooth performance and long-term durability. This guide details the correct procedures for installation, adjustment, maintenance, troubleshooting, and optimization specifically for the SID SL Ultimate 2P model.
Tools Required
- Torque wrench [paid link] with Nm scale
- 2mm, 4mm, and 5mm hex keys [paid link]
- Flat blade screwdriver
- RockShox Butter or equivalent suspension grease
- 15wt suspension oil (for lower leg service)
- Clean rags and isopropyl alcohol
- Seal press tool and pick set
- Shock pump with accurate pressure gauge
Correct Installation Procedure
Installing the SID SL Ultimate 2P fork requires precision and compatibility awareness. Begin by confirming that your headtube is suitable for a 1.5” to 1-1/8” tapered steerer and that your front axle setup matches the 15x110mm Boost standard.
Start by cutting the steerer tube to the correct length based on your frame stack height. Always use a guide tool for a square cut. After deburring and cleaning the steerer, press in the appropriate star nut or install the threaded insert if using a compression cap system.
Install the fork into the headset with headset bearing grease applied to the contact surfaces. Torque the stem bolts to the manufacturer’s spec—typically 5-6 Nm. When mounting the front wheel, ensure the Maxle Stealth axle is tightened to the recommended 9-11 Nm to avoid play or misalignment.
Proper Setup and Adjustment
The SID SL Ultimate 2P uses a two-position Charger Race Day damper (open/lock) and an adjustable Solo Air spring. To set the correct sag, release all air using the shock pump, then incrementally inflate the air spring to match rider weight. Aim for 15-20% sag, measured by compressing the fork and observing the dust wiper’s position.
Lockout functionality is cable-actuated and must be installed with precise cable tension. The lever should have a defined ‘click’ between open and lock. Check routing to ensure minimal friction and avoid tight bends.
Rebound adjustment is made via a red knob at the fork’s lower right leg. Turn it clockwise to increase damping (slower rebound) or counter-clockwise for a quicker response. Base settings can start at 4-6 clicks from fully closed and adjusted based on terrain and rider preference.
Routine Maintenance Guidelines
Regular servicing extends performance and prevents premature wear. The lower leg service should be performed every 50 riding hours. This involves removing the lowers, cleaning old oil and debris, and replacing wiper seals if necessary.
Apply suspension grease to the foam rings and inside the wiper seals. Use 15wt oil in each leg—10cc on the damper side and 10cc on the air side. Reassemble and torque lower bolts to 7 Nm. Cycle the fork to evenly distribute the oil before riding.
Air spring service, including cleaning and regreasing the negative spring sealhead and air piston, should be done every 100 hours. Use RockShox Butter and inspect seals for wear or deformation.
Troubleshooting Setup Issues
Common problems include excessive stiction, inadequate rebound, or air pressure leakage. Stiction usually results from dry or dirty seals—clean and re-lubricate the wipers. If rebound feels inconsistent, verify oil levels and inspect the damper for fluid contamination or loss.
If the fork loses air over time, check the Schrader valve core for tightness and inspect the air can seals. Replacing the air spring seals may be necessary if leakage persists.
Remote lockout systems may fail to engage if cable tension is incorrect. Loosen the pinch bolt, re-tension with the lever in the open position, and retighten at 1.5-2 Nm.
Customization and Performance Optimization
Optimizing the SID SL Ultimate 2P depends on rider weight, terrain, and racing goals. Riders can tune air volume using Bottomless Tokens to adjust spring ramp. Removing tokens provides a more linear feel, while adding tokens increases end-stroke progression.
For racers targeting technical XC courses, lowering tire pressure slightly and reducing rebound damping allows better traction and responsiveness. Conversely, a firmer rebound and one added token can suit smoother, high-speed circuits.
Professional racers often combine setup changes with remote lockout positioning and lightweight handlebars for seamless cockpit integration.
Comparative Overview with Similar Forks
The SID SL Ultimate 2P stands apart from models like the Fox 32 SC and the Manitou R7 Pro through its lower weight (approximately 1326g) and Race Day damper simplicity. Unlike the Fox FIT4 system, which provides three compression settings, the SID SL’s 2-position damper is streamlined for racing efficiency.
Compared to the standard SID Ultimate, the SL version has a shorter maximum travel (100mm vs. 120mm) and narrower stanchions (32mm vs. 35mm), emphasizing weight savings over stiffness. Riders preferring aggressive trail features may opt for the regular SID Ultimate for its broader tuning range.
Compatibility With Drivetrain and Components
The SID SL Ultimate 2P uses a Boost 15×110 axle and flat-mount disc brake interface. It is fully compatible with SRAM Level, Shimano XTR, and TRP race brake systems, provided they match the 160mm post-mount or adapt accordingly.
Its short offset options (44mm) work best with modern XC geometries. Ensure your frame’s axle-to-crown measurement and internal routing pathways accommodate remote lockout cable runs cleanly.
For cockpit integration, RockShox’s TwistLoc or OneLoc remotes pair best, although standard levers are acceptable when clearance is limited.
Conclusion
Servicing and fine-tuning the RockShox SID SL Ultimate 2P requires attention to detail, proper tools, and a clear understanding of its internal design. With regular maintenance, precise setup, and the right customizations, this fork offers elite-level performance for competitive cross-country riders.