Fox Suspension IsoStrut Damper Rebuild Kit

This kit is specifically engineered for the Trek IsoStrut rear shock system. While it covers the standard service requirements for this model, always verify your specific shock year and generation to ensure full compatibility before starting your service.

The kit contains the essential seals, O-rings, and wear components required to perform a standard damper service. It provides the specific parts needed to restore damping efficiency and prevent oil leaks, though it does not include suspension fluid or specialized tools.

For consistent performance, we recommend a damper service every 50 to 100 hours of ride time, depending on the conditions you ride in. If you notice a loss in damping control, unusual noises, or visible oil weeping, it is time to rebuild regardless of your hour count.

If you are comfortable with suspension maintenance and have the necessary tools—such as a shock pump, seal drivers, and the correct suspension fluid—this is a manageable task for a home mechanic. If you lack experience with internal shock service, we recommend having a professional technician handle it to avoid damaging the damper internals.

Often, a loss of lockout is caused by contaminated oil or worn internal seals, which this kit addresses. However, if the internal damper cartridge itself is damaged or scratched, a simple seal kit may not resolve the issue.