RockShox Rebound Damper and Seal Head Assembly for SID B1

This specific assembly is designed exclusively for SID B1 model forks. You should verify your fork's specific model year and generation before purchasing, as internal damper parts are rarely cross-compatible between different RockShox generations.

You likely need a replacement if you notice your fork failing to return to full extension after compression, a 'sluggish' or inconsistent rebound feel, or if you see oil leaking from the bottom of the lower leg. These are clear signs that the internal seals or the damper mechanism itself have worn out.

Replacing a damper assembly requires basic suspension service knowledge and specific tools, such as a cassette tool or socket for the bottom bolt and snap-ring pliers. If you are comfortable performing a standard lower-leg service, you can handle this, but consult your fork's service manual to ensure you have the correct oil weights and volumes.

Yes, this is a complete assembly that includes the seal head, which is the critical component for preventing oil migration and maintaining pressure. It is a drop-in replacement designed to restore your fork's damping performance to factory standards.

Not necessarily. While a faulty damper can cause issues, a fork stuck in a compressed position is often related to an air spring failure or pressure equalization issue rather than the rebound damper. We recommend checking your air spring assembly first if the fork is failing to extend.