Fox Suspension Factory CSU

CSU stands for Crown, Steerer, and Uppertube. This assembly is a single, integrated component that includes the crown, the steerer tube, and the two upper stanchion tubes, which are pressed together at the factory.

No, this is a direct replacement part designed to match your existing fork's specific geometry. You must select the version that matches your current wheel size and travel configuration to maintain the fork's intended handling characteristics.

This specific assembly is engineered for 2018 Fox 36 models. While some parts may share dimensions, Fox frequently updates tolerances and steerer tube designs, so it is critical to match the model year to ensure proper fitment with your lowers and internals.

Yes, swapping a CSU requires advanced suspension service tools, including a crown race puller and potentially a press to properly seat the assembly into your existing lower legs. If you are not comfortable with high-level suspension maintenance, we recommend having a professional mechanic perform the installation.

Replacing the CSU is typically necessary if the stanchion tubes are scratched or worn, or if the steerer tube has been cut too short or damaged. Because the stanchions are permanently pressed into the crown, they cannot be replaced individually, making the CSU assembly the only solution for these specific issues.