FSA NO.55R Headset

No, this headset is specifically engineered for a 1.8-inch steerer tube interface. It will not fit standard 1-1/8 inch or tapered 1.5-inch steerer tubes.

Yes, the NO.55R is designed for frames that support internal cable routing (ICR). Your frame must have the necessary ports and clearance to allow cables to pass through the headset assembly.

This model uses high-quality sealed cartridge bearings. While they are designed for long-term durability and resistance to the elements, they are typically replaced as a unit rather than serviced or repacked with grease.

The main benefit is the integration of cable routing, which cleans up your cockpit by hiding cables inside the headset assembly. This improves aerodynamics and creates a much sleeker, clutter-free aesthetic for modern performance bikes.

Not necessarily. While it is an integrated cup design, you must ensure your frame's headtube dimensions and the specific ICR system match the NO.55R specifications. Always check your frame manufacturer's headset requirements before purchasing.