Fox Suspension Damper Assembly

This assembly is designed specifically for Fox 34 Step-Cast forks with 120mm of travel and 29-inch wheels. Always verify your fork's model year and serial number on the Fox Help Center website to ensure the part number 820-18-380-kit matches your exact chassis.

Yes, this is a complete drop-in damper assembly. It comes pre-assembled, so you won't need to source individual internal components, though you will still need the appropriate suspension fluid and standard shop tools to perform the swap.

Absolutely. Because this is a factory-spec replacement, it replaces the worn internal valving and seals that degrade over time. It is the most effective way to regain the consistent damping control and responsiveness your fork had when it was new.

If you are comfortable performing routine lower-leg services and have the correct tools, this is a straightforward installation. However, if you are not experienced with internal suspension work, a professional mechanic is recommended to ensure the damper is seated correctly and the system is bled properly.

You likely need a new damper if you notice a loss of damping adjustment, a 'squishy' or inconsistent feel, or if the lockout lever no longer fully firms up the fork. These symptoms typically indicate that the internal seals have worn out or the oil has become contaminated.