Home » headsets » Tapered Headsets » c566a-4 TAPERED HEADSETS C566A-4 ZS44/28.6 I ZS66/40 Alloy, Sealed Bearings 1-1/8″ to 1.5″ Tapered Head Tube & Steerer Top Nut: 1-1/8″ Cup O.D.: 44/66 Crown Cone: 39.8 Height: 12 Technical Diagram