FSA UHSET 55R ACR IS52/28.6 OD56

Innovative, fully integrated aluminum headset with Aero Cable Routing
System (ACR) for clean internal cable routing. Suitable for 1 1/8""-1.5""
tapered head tubes, with high-quality bearing setup for stability and
durability. Requires ACR-compatible frame – ideal for modern,
aerodynamic cockpit designs.