The RockShox SID Select+ suspension fork is designed for aggressive cross-country (XC) racing, combining high-end performance with weight-conscious engineering. Known for its refined damping, lightweight chassis, and superior tunability, the SID Select+ sits just below the Ultimate version in RockShox’s product hierarchy. This guide will provide a comprehensive breakdown of its installation, adjustment, maintenance, troubleshooting, optimization, and compatibility with drivetrain and cockpit components.

Tools Required

• 6 mm and 5 mm hex keys [paid link]
• Torque wrench [paid link] with Nm settings
• Shock pump
• Suspension grease
• Clean microfiber rags
• Isopropyl alcohol
• Pick or seal tool for dust wiper removal
• Oil syringe for damper service

Installation Procedure

Installing the SID Select+ requires attention to headset alignment, torque settings, and brake compatibility. First, cut the steerer tube to your desired length. Always account for headset spacers and stem height when marking the cut line. Use a crown race setter to install the race properly, ensuring it’s flush with the base of the crown.

Next, insert the fork into the head tube and loosely install the headset spacers and stem. Align the stem with the front wheel and tighten the top cap to preload the headset bearings. Secure the stem bolts to the manufacturer’s torque specification. When mounting the brake caliper, ensure the flat-mount or post-mount standard matches your fork. Adjust rotor alignment to prevent rubbing.

Air Spring and Damping Adjustment

The SID Select+ features the DebonAir+ air spring and Charger RL damper, both engineered to offer mid-stroke support and small bump compliance.

Set the sag by inflating the air spring to match your rider weight. Aim for 15–20% sag at full extension. Use a shock pump to make fine adjustments and always equalize air pressure between positive and negative chambers by cycling the fork after inflation.

Rebound adjustment is located at the bottom of the right leg. Turn the dial clockwise for slower rebound and counter-clockwise for faster response. For the Charger RL damper, the compression knob at the top of the right stanchion offers a lockout mode and a single open setting, ideal for riders looking for simplicity over extensive adjustability.

Maintenance Routine

Routine maintenance preserves the fork’s performance and longevity. Clean the stanchions and dust wipers after every ride using a microfiber rag and isopropyl alcohol. Reapply suspension-specific lubricant to minimize stiction.

Lower leg service is recommended every 50 hours of riding. Remove the lowers by loosening the bolts and gently tapping them to free the seal. Drain the old oil and clean the inside of the lowers thoroughly. Replace foam rings, dust wipers, and seals as needed. Re-lubricate with the recommended suspension grease and refill with RockShox 0W-30 oil.

For damper servicing, follow RockShox’s service interval of 100 hours. The Charger RL damper is a sealed cartridge unit, so rebuild kits and bleed tools are required. Use an oil syringe to inject fresh damper fluid and remove air bubbles.

Troubleshooting Setup Issues

Common setup issues include excessive harshness, inconsistent rebound, and bottoming out. Harshness typically stems from over-inflation or dried-out dust wipers. Recheck sag settings and inspect for dirt accumulation under the seals.

Inconsistent rebound may signal air mixing into the damper fluid or low oil volume. Check for oil leaks and ensure the rebound dial is not obstructed.

Frequent bottoming out suggests under-inflation or insufficient compression support. Reassess your air pressure and verify if your riding style demands volume spacers, which increase progression at the end of the stroke.

Performance Customization

Although the SID Select+ does not offer the full tunability of the Ultimate version, there are still options for personalizing performance. Adding Bottomless Tokens (volume spacers) alters the air spring curve, making the fork more progressive. This prevents harsh bottom-outs for aggressive riders.

You can also fine-tune rebound damping by counting clicks from fully closed. Start with the manufacturer’s recommended setting for your weight, then adjust incrementally based on trail feedback.

Some riders opt to upgrade to the Ultimate’s Charger Race Day damper for more precise compression tuning. While not officially endorsed, this mod is mechanically compatible and often pursued by competitive riders.

Compatibility with Other Components

The SID Select+ is optimized for 29-inch XC bikes with a tapered steerer and 44 mm offset. It supports Boost axle spacing (15×110 mm) and flat-mount disc brakes up to 180 mm rotor diameter with the correct adapter.

The fork integrates well with SRAM and Shimano drivetrains. However, the lockout lever on the Charger RL is not compatible with remote lockout systems without aftermarket modifications. For cockpit integration, ensure your handlebar and stem can accommodate the overall stack height post-installation.

Model Comparison: SID Select+ vs SID Ultimate

The SID Select+ offers nearly the same chassis and air spring as the Ultimate, but at a more approachable price. The key difference lies in the damper: the Select+ uses the Charger RL with two-position compression, while the Ultimate features the lighter, race-tuned Charger Race Day 2 damper with more adjustment options.

Weight differences are minimal (typically under 100 grams), but performance-focused riders may prefer the Ultimate for its adjustability. However, for riders prioritizing simplicity and budget, the Select+ delivers high-end performance without the price premium.

Conclusion

The RockShox SID Select+ is a technically refined XC fork that balances lightweight performance with practical adjustability. With proper installation, setup, and maintenance, it delivers consistent control on demanding trails. Its compatibility with a range of drivetrains and potential for customization make it a versatile choice for both competitive and enthusiast riders alike.