DIY Guide: Suspension Fork Inspection for SID Select+

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The RockShox SID Select+ suspension fork is a lightweight, performance-oriented component designed primarily for cross-country (XC) racing and high-speed trail riding. Ensuring your SID Select+ operates at peak efficiency requires regular inspection and maintenance. This guide provides step-by-step instructions for inspecting the SID Select+ fork, identifying common issues, and performing basic service procedures to maintain optimal performance.

Tools Required

  • 4 mm and 5 mm hex keys [paid link]
  • Torque wrench [paid link] with hex bit set
  • Suspension pump
  • Clean rags and isopropyl alcohol
  • Pick tool or flat plastic tool
  • Suspension-specific grease
  • RockShox 0W-30 suspension oil
  • Lower leg service kit (recommended for full maintenance)

Overview of the SID Select+ Suspension Fork

The SID Select+ features a DebonAir spring system and Charger RL damper, designed for balance between weight savings and trail compliance. It comes with 32mm or 35mm stanchions depending on year and model spec, and supports travel configurations from 100mm to 120mm. The fork includes Boost axle spacing and is compatible with flat mount brakes.

Pre-Inspection Safety Checks

Before beginning any inspection:

  • Ensure the bike is clean and placed on a stable work stand.
  • Confirm the front wheel is removed, and the axle is set aside.
  • Deflate all air pressure from the fork using the suspension pump.
  • Use a clean rag and isopropyl alcohol to wipe down the stanchions and lower legs.

External Visual Inspection

Begin with a comprehensive visual inspection of the exterior:

  • Stanchion Tubes: Check for scratches, nicks, or signs of oil leakage. Damage here directly impacts suspension performance and seal life.
  • Dust Seals and Foam Rings: Inspect for cracks, dryness, or signs of wear. Excess dirt accumulation indicates compromised seals.
  • Crown and Arch: Look for stress fractures or signs of deformation. Minor cracks can become severe under load.
  • Axle Interface: Inspect for stripped threads or worn contact points at the dropouts and axle.
  • Steerer Tube: Check for signs of corrosion or ovalization, particularly around headset contact points.

Internal Functional Inspection

To evaluate performance beyond visuals:

  • Compression and Rebound Response: Manually compress the fork and observe rebound speed. Irregular movement or “dead spots” can signal damper or air spring issues.
  • Damper Lockout Function: Engage the Charger RL lockout and test resistance during compression. If the fork compresses easily while locked, the damper may need servicing.
  • Air Spring Consistency: Inflate the fork to your standard pressure. If pressure drops rapidly, inspect the Schrader valve and air seal integrity.

Lower Leg Service Procedure

A lower leg service restores smooth movement and ensures proper lubrication. Perform this every 50 hours of ride time:

  1. Drain Old Oil: With fork inverted, remove lower leg bolts using a 4 mm hex key. Gently pull the lowers off the stanchions.
  2. Clean Internals: Remove old oil and debris with isopropyl alcohol. Clean foam rings and seals or replace if worn.
  3. Lubrication: Soak foam rings in fresh RockShox 0W-30 oil. Apply suspension grease to dust seals.
  4. Reassembly: Slide lower legs back onto stanchions. Tighten bolts to factory-specified torque (5.65 Nm).
  5. Final Oil Bath: Add 10ml of suspension oil per leg through the bottom bolts before final assembly.

Troubleshooting Common Issues

The SID Select+ may develop several common issues over time:

  • Excessive Fork Dive: May result from low air pressure or worn air spring seals. Check pressure and consider an air spring rebuild.
  • Sticky or Harsh Travel: Often caused by dry seals or contaminated oil. A lower leg service typically resolves this.
  • Leaking Damper: Oil at the top cap or damper leg can signal an internal leak. Requires full damper service or cartridge replacement.
  • Unresponsive Lockout: If lockout doesn’t engage, the Charger RL damper likely needs a factory rebuild.

Performance Optimization Tips

For riders seeking a more responsive or plush feel:

  • Add or Remove Volume Tokens: These adjust the spring curve to be more linear or progressive, tailoring the feel to your terrain.
  • Adjust Rebound Dial Properly: Faster rebound for technical, slow terrain; slower rebound for high-speed descents.
  • Air Pressure Tuning: Refer to RockShox pressure charts as a starting point, but fine-tune based on sag and ride feel.
  • Charger Damper Bleed: A professional bleed can restore damping consistency if changes in performance are felt.

Customization and Upgrade Paths

The SID Select+ is upgradable for riders wanting enhanced control:

  • Charger Race Day Damper: Lighter and more tunable than the RL version, ideal for competitive XC racing.
  • Maxima Plush Oil: Enhances damping consistency and reduces friction in high-load riding.
  • SKF Low Friction Seals: Replace OEM seals for smoother fork movement and extended service intervals.

Compatibility and Integration

Ensure the SID Select+ integrates well with your setup:

  • Brake Mount: Flat mount disc brakes with 160mm to 180mm rotors using adapters.
  • Axle Standard: Boost 15×110 mm thru-axle required.
  • Headset: Tapered steerer fits 1.5” to 1-1/8” integrated or external headsets.
  • Wheel Size: Compatible with 29” wheels, limited 27.5” support depending on offset and clearance.

Comparison with Similar Models

SID Ultimate vs SID Select+: The Ultimate features the Race Day damper and lighter materials, offering higher performance but at a premium price.

Reba RL vs SID Select+: The Reba offers similar travel and support but is heavier and lacks the advanced damping of the SID Select+.

Fox 32 Step-Cast vs SID Select+: The Fox offers a lighter chassis and more race-specific tuning but may feel harsher over rough terrain compared to the SID’s DebonAir spring.

FAQs

1. How often should I inspect my SID Select+ fork?
Every 25-50 riding hours for general inspection. Full servicing should be done every 100 hours or annually.

2. What signs indicate a failing damper in the SID Select+?
Loss of lockout function, excessive oil at the top cap, or inconsistent rebound response are primary indicators.

3. Can I replace the Charger RL damper with a Race Day damper in the SID Select+?
Yes, both dampers are compatible with the same chassis, offering a performance upgrade option.

4. Do I need a torque wrench [paid link] for servicing the SID Select+?
Yes, using a torque wrench ensures all bolts are tightened to factory specifications, preventing damage or under-tightening.

5. What is the correct air pressure for my weight?
Refer to the RockShox setup chart, but a good rule of thumb is 15-20% sag when seated. Fine-tuning is recommended for individual preference.

6. Why does my fork feel stiff after service?
Over-greasing or improper oil levels can increase friction. Ensure seals are lubricated correctly, and oil volumes match manufacturer specs.