FSA NO.55R Headset

This headset is specifically designed for frames that support integrated cable routing (ICR) and require a 1.8-inch steerer tube diameter. Before purchasing, verify that your frame's head tube is compatible with this specific integrated standard, as it is not a universal fit for all bikes.

Integrated Cable Routing means your brake and shift lines pass directly through the headset assembly rather than entering the frame through external ports. While this creates a cleaner look and improved aerodynamics, it does make routine maintenance or replacing cables slightly more involved than with traditional external routing.

No, the NO.55R is engineered specifically for a 1.8-inch steerer tube diameter. It will not be compatible with standard 1 1/8-inch or traditional tapered steerer tubes, so ensure your fork matches this specific dimension.

Yes, the design of the NO.55R is generally compatible with both mechanical and electronic shifting setups, provided your frame and cockpit components are also designed to accommodate the internal routing of those specific lines.

Yes, the NO.55R is a complete assembly that includes the necessary bearings and seals required for installation. It is designed to be a direct replacement or upgrade for compatible ICR-ready frames.