The RockShox SID SL Ultimate 3P is engineered for serious XC riders seeking premium suspension performance in a lightweight package. This model prioritizes stiffness-to-weight ratio and precision handling, while incorporating the trusted Charger Race Day 2 damper and three-position compression adjustment. To optimize comfort and control, this guide provides a thorough walkthrough for installation, adjustment, maintenance, troubleshooting, performance customization, and compatibility considerations specific to the SID SL Ultimate 3P.
Tools Required
- 6mm and 5mm hex keys [paid link]
- Torque wrench [paid link] with appropriate bits
- Star nut setting tool (if installing a new steerer tube)
- Shock pump (for setting air pressure)
- Suspension oil and grease
- Clean rags and isopropyl alcohol
- Crown race setter and headset press (for installation)
- Small flathead screwdriver (for seal service)
- Pick tool (for removing foam rings)
Installation Guidelines for the SID SL Ultimate 3P
Proper installation ensures optimal function and longevity of the fork. Begin by verifying compatibility with your frame and headset.
Steerer Tube Prep and Fitment
The SID SL Ultimate 3P features a 1.5” to 1-1/8” tapered steerer tube. If the steerer is uncut, determine your appropriate stack height and trim it using a pipe cutter or saw guide. Install the star nut using a star nut setter. Grease the crown race seat, then press on the appropriate headset crown race.
Fork Mounting
Insert the fork into the head tube with bearings and spacers in place. Align the stem and lightly tighten the stem bolts. Adjust the preload with the top cap, ensuring smooth steering without play. Torque stem bolts to manufacturer specifications.
Brake and Axle Setup
The SID SL Ultimate 3P supports flat-mount or post-mount disc brakes. Install the front brake caliper, aligning it with the rotor. Thread in the Maxle Stealth or Maxle Ultimate axle and torque to 9-11 Nm. Ensure rotor clearance and brake pad alignment.
Suspension Adjustment and Tuning
Tuning the suspension enhances rider comfort across varied XC terrain. The 3P refers to the three-position compression switch: Open, Pedal, and Lock.
Air Spring Setup
The DebonAir spring requires specific air pressure based on rider weight. Use the RockShox air pressure chart as a starting point. Attach a shock pump to the valve located under the top cap on the non-drive side. Inflate to the target pressure, then cycle the fork several times to equalize the chambers.
Sag Measurement
Adjust sag to 15-25% of travel. Slide the O-ring against the wiper seal and compress the fork while seated on the bike. Measure the exposed stanchion to confirm sag is within range.
Compression Settings
The 3P switch, found on the top of the right fork leg, adjusts compression:
- Open: Fully active damping for descents and rough trails.
- Pedal: Medium compression for mixed terrain and improved efficiency.
- Lock: Minimal compression for sprints and smooth climbs.
Switch positions can be changed on-the-fly to adapt to trail conditions.
Rebound Damping
Located at the bottom of the right leg, rebound controls the return speed of the fork. Start at the middle setting and fine-tune based on feedback—too fast results in a bouncy ride, too slow causes packing.
Routine Maintenance Procedures
Consistent maintenance preserves fork sensitivity and performance.
Lower Leg Service
Recommended every 50 hours of riding. Remove the lowers after draining oil, replace foam rings and dust seals, and apply suspension grease. Reinstall lowers with fresh 0W-30 oil through the bottom bolts.
Air Spring Cleaning
Inspect and clean every 100 hours. Remove the top cap and air spring assembly. Clean all parts and replace O-rings as needed. Apply slickoleum to moving parts before reassembly.
Damper Maintenance
The Charger Race Day 2 damper is a sealed unit not meant for user service. If degradation in compression or rebound control is noticed, send it to a RockShox service center.
Troubleshooting Common Issues
Fork Not Compressing Smoothly
This often results from dry or contaminated seals. Perform a lower leg service and inspect for worn foam rings or excessive debris.
Excessive Stiction
Check for improper torque on the axle, or overly tight headset preload. Also inspect stanchion lubrication and bushing interface.
Leaking Oil
Look for oil accumulation near the dust wipers or bottom bolts. Replace seals and confirm proper oil volume and bolt torque.
Rebound or Compression Not Engaging
If the rebound dial spins freely or the compression switch feels vague, the damper may be damaged or under-lubricated. Consult a technician for rebuild or replacement.
Customizing for Performance and Comfort
Token Spacers
Install Bottomless Tokens to increase ramp-up and prevent bottom-outs. Each token reduces air volume, making the spring curve more progressive.
Remote Lockout Compatibility
Integrate with RockShox TwistLoc or OneLoc for bar-mounted control. These remotes enable efficient transitions between Open, Pedal, and Lock modes.
Offset and Axle-to-Crown Adjustment
The SID SL Ultimate 3P comes in 44mm offset. Ensure your frame geometry is compatible. Axle-to-crown measurement is fixed at ~506mm, which influences head angle and ride feel.
Comparing the SID SL Ultimate 3P to Similar Models
Compared to the SID Ultimate (non-SL), the SL version prioritizes weight savings by using 32mm stanchions and slimmer lowers. This makes it ideal for competitive XC where every gram counts.
In contrast, the FOX 32 Step-Cast Factory offers similar weight and stiffness, but the SID SL often edges out in damper consistency and tactile responsiveness. The 3P adjustment is more intuitive for racers who switch terrain often.
The SID Select+ is a more affordable version but lacks the Charger Race Day 2 damper and carbon crown found on the Ultimate variant. Riders prioritizing budget over peak performance may opt for Select+.
Drivetrain and Component Compatibility
The SID SL Ultimate 3P is designed around a Boost 110mm spacing standard and supports 29” wheels with up to 2.4” tire width. Ensure front hub and wheel compatibility.
It accepts flat-mount or post-mount brakes with adapters. Rotor size maxes out at 180mm without voiding warranty. Suspension travel is fixed at 100mm for the SL version, so pairing with matching rear suspension travel optimizes balance.
Handlebar-mounted remote lockout is compatible with SRAM MatchMaker and other 2-position or 3-position setups, offering integration flexibility.
Frequently Asked Questions (FAQs)
1. Can the SID SL Ultimate 3P be used for trail riding?
While optimized for XC, it can handle light trail use. However, aggressive trail riders should consider the regular SID or Pike for more travel and stiffness.
2. How often should I service the fork?
A lower leg service is recommended every 50 hours of riding, with a full air spring service every 100 hours. Adhering to this schedule prevents performance loss.
3. What pressure should I use in the air spring?
Use the RockShox air pressure guide based on rider weight. Fine-tune from there depending on ride feel and desired sag.
4. Can I install a remote lockout on the SID SL Ultimate 3P?
Yes, it’s compatible with RockShox remote lockout systems like TwistLoc and OneLoc, which provide bar-mounted access to the 3P damper settings.
5. Is the Charger Race Day 2 damper user-serviceable?
No. This damper is a sealed unit and must be serviced or replaced by an authorized service center if it malfunctions.
6. What is the axle-to-crown measurement and why does it matter?
The SID SL Ultimate 3P has a ~506mm axle-to-crown. This affects head angle and ride height; ensure your frame is designed for this length for optimal geometry.