Home » headsets » Tapered Headsets » c566a-3 TAPERED HEADSETS C566A-3 ZS44/28.6 I ZS66/45.8 Alloy, Sealed Bearings 1-1/8” to 1.8″ Tapered Head Tube & Steerer Top Nut: 1-1/8″ Cup O.D.: 44/66 Crown Cone: 45.8 Height: 12 Technical Diagram