DIY Suspension Fork Maintenance: Care Tips for Your SID Select+

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The RockShox SID Select+ is a premium cross-country suspension fork that delivers high performance with minimal weight. Known for its refined damping, adjustable air spring, and efficient lockout system, the SID Select+ remains a popular choice among racers and technical trail riders alike. This guide covers everything you need to know to keep your SID Select+ functioning optimally—from installation and tuning to routine maintenance and troubleshooting.

Tools Required:

  • Torque wrench [paid link] with 5mm, 6mm, and 8mm hex bits
  • Flat-blade screwdriver
  • Suspension-specific grease and lubricants
  • RockShox suspension oil (15wt and 5wt)
  • Shock pump
  • Clean rags and isopropyl alcohol
  • Pick tool or dental pick
  • Lower leg removal tool (if available)
  • Oil measuring syringe or graduated beaker

Installation Overview

Proper installation of the SID Select+ sets the foundation for performance and longevity. Whether you’re upgrading or replacing an existing fork, attention to detail is critical.

Steerer Tube Preparation and Crown Race Installation

Ensure the steerer tube is cut to the correct length for your bike. Use a cutting guide and file to smooth any rough edges. Install the crown race using a proper setting tool to avoid damage to the steerer or race. A misaligned crown race can lead to play in the headset or premature wear.

Star Nut Insertion and Fork Mounting

Insert the star nut evenly using a star nut setter tool. Mount the fork onto the frame, ensuring the headset bearings are well-greased. Tighten the top cap and stem bolts to manufacturer-recommended torque specifications.

Brake and Axle Installation

Attach the brake caliper using the correct adapter for your rotor size. Always align the caliper after tightening the axle. Install the thru-axle while ensuring the hub is properly seated. Torque the axle according to RockShox specifications.

Air Spring Setup and Sag Adjustment

Correct air pressure ensures that the fork performs within its intended range. Use a shock pump to adjust pressure based on rider weight and terrain preference.

Setting the Sag

Slide the o-ring down to the wiper seal. Sit on the bike in your normal riding position. Dismount carefully and measure the sag. Ideal sag is typically 15–25% of total fork travel. Adjust the air pressure until the desired sag is achieved. The SID Select+ uses RockShox’s DebonAir spring, so changes in pressure have a pronounced effect on small bump compliance.

Rebound and Compression Settings

Use the rebound dial (usually red) at the fork’s bottom leg to fine-tune how fast the fork returns after compression. Start in the middle of the adjustment range and make incremental changes. The compression lever (blue) on top of the fork allows on-the-fly adjustment and lockout for climbing.

Routine Maintenance Schedule

Consistent maintenance enhances performance and extends the fork’s lifespan. RockShox recommends lower leg servicing every 50 hours and full service every 100–200 hours.

50-Hour Lower Leg Service

This involves removing the lower legs, cleaning the internals, and replacing the bath oil.

  • Remove the air from the spring.
  • Loosen and remove the lower bolts while catching any oil that drains.
  • Slide off the lower legs carefully.
  • Clean wiper seals and foam rings.
  • Re-lubricate with suspension grease.
  • Add new oil to the lowers before reinstalling.
  • Torque bolts to specification and perform a functional check.

100-Hour Damper and Air Spring Service

More complex, this service includes disassembly of the air spring and damper. It’s best performed with a full service kit and following RockShox’s technical manual closely. Key steps include:

  • Removing the top cap and damper rod.
  • Replacing seals and o-rings.
  • Bleeding the damper using vacuum or syringe method.
  • Reassembling with new fluids and proper torque settings.

Troubleshooting Common Issues

Some recurring problems with the SID Select+ can be resolved with simple diagnostics.

Stiction or Harsh Initial Stroke

Check for dry seals or dirty stanchions. Clean thoroughly and apply suspension-specific grease under the wiper seals.

Fork Losing Air

Inspect the Schrader valve for leaks. If the air spring continues to deflate, the piston o-ring or air shaft may be compromised and require service.

Oil Leaks at Seals

Excessive oil around the seals suggests worn wipers or overfilled bath oil. Replace the seals and ensure correct oil volume during service.

Knocking or Top-Out Noise

This often signals a damper issue. Air may have entered the damper circuit, requiring a full damper bleed.

Optimization for Performance

Custom tuning enhances how the SID Select+ performs for different riders and terrain.

Volume Spacers

Install volume spacers in the air spring to increase progression and prevent bottom-out. This is particularly useful for aggressive riders or those riding rougher terrain.

DebonAir Air Spring Upgrade

Ensure your fork has the latest DebonAir spring version. Newer iterations improve small bump sensitivity and mid-stroke support.

Aftermarket Compression Damper

Consider an aftermarket compression damper like the RockShox Charger Race Day damper for enhanced tuning range and lighter weight. Confirm compatibility before installing.

Compatibility Considerations

The SID Select+ uses a 110mm Boost spacing and is designed for 29″ wheels. It’s compatible with most modern XC frames and drivetrains but always verify clearance and rotor compatibility.

  • Steerer: Tapered 1.5″ to 1-1/8″
  • Offset: Commonly 44mm, check your frame geometry
  • Max rotor size: 180mm (adapter needed for larger sizes)

Ensure the headset and axle standards of your frame match the fork’s specs. Incompatibility can lead to poor handling or hardware stress.

Comparison with Similar Fork Models

SID Select vs SID Select+

The main difference lies in the damper. While both feature the DebonAir spring, the Select+ includes a more adjustable Charger 2 RL damper for better control. Select+ also uses lighter materials and has enhanced internal tuning.

SID Select+ vs SID Ultimate

The SID Ultimate is lighter due to a carbon crown-steerer and has the Charger Race Day damper. It offers more adjustability and is intended for elite racers. However, for most riders, the SID Select+ provides nearly identical performance at a lower cost.

FAQs

How often should I service my SID Select+ fork?
Routine lower leg maintenance should be done every 50 hours. Full damper and air spring service is recommended every 100–200 hours of use.

Can I use a 27.5″ wheel with the SID Select+?
No, the SID Select+ is designed specifically for 29″ wheels and will not provide proper clearance for 27.5″ wheels.

Is the SID Select+ compatible with a remote lockout?
Yes, the fork can be upgraded with a remote lockout kit compatible with the Charger 2 RL damper.

What is the maximum rotor size I can use?
The fork supports up to a 180mm rotor with an adapter. Larger rotors are not recommended as they may stress the fork’s arch and lower legs.

Can I change the travel on the SID Select+?
Yes, the travel can be changed within a limited range (100mm–120mm) by replacing the air shaft. This should be done by a trained mechanic.

What is the weight of the SID Select+ fork?
The SID Select+ weighs approximately 1,525 grams, depending on the steerer tube length and axle configuration.

Conclusion

Maintaining the RockShox SID Select+ is essential for preserving its race-level performance and reliability. Regular care, proper installation, and thoughtful customization allow riders to get the most out of this high-performance fork. Whether you’re racing cross-country or exploring technical singletrack, a well-maintained SID Select+ will provide smooth, efficient suspension performance for years to come.