Home » headsets » Integrated Headsets » c361a INTEGRATED HEADSETS C361A IS52/28.6 I IS52/40 Alloy, Sealed Bearings 1-1/8” to 1.5” Tapered Steerer Top Nut: 1-1/8″ Bearing O.D.: 52 Crown Cone: 39.8 Height: 8.3 Technical Diagram