Home » headsets » internal cable routing » c522a-1 INTERNAL CABLE ROUTING HEADSET C522A-1 IS52/28.6 | ZS52/40 Alloy, Sealed Bearings 1-1/8″ to 1.8″ Tapered Head Tube & Steerer Top Nut: 1-1/8″ Bearing O.D.: 51.8 Crown Cone: 45.8 Height: 11.2 Weight: 138g Technical Diagram