FSA SX Pro Internal Headset

An internal headset, often called an integrated or semi-integrated headset, means the bearing cups are pressed directly into the headtube of your frame rather than sitting outside of it. This design creates a cleaner look and a lower stack height compared to traditional external cup headsets.

Compatibility depends on your frame's specific headtube dimensions. You need to verify that your frame is designed for an internal headset and matches the bearing diameter and angle requirements of the FSA SX Pro. It is best to consult your frame manufacturer's specifications before purchasing.

The 5mm stack height refers to the vertical space the headset occupies above the headtube. A low profile like this is ideal if you are trying to keep your handlebar height as low as possible or if you have limited steerer tube length to work with.

The FSA SX Pro uses sealed cartridge bearings, which are designed to be low-maintenance and resistant to dirt and moisture. While they are not meant to be opened and repacked with grease, they are easily replaceable as a unit once they eventually wear out.

Yes, this headset includes the required crown race, which is the component that presses onto your fork's steerer tube to provide the interface for the bottom bearing. Ensure you have the proper tools to press it on securely without damaging the fork.