Home » headsets » Tapered Headsets » hrk1-hrk2 TAPERED HEADSETS HRK1 | HRK2 ZS44/28.6 | ZS55/40 Alloy Cap/Cup Sealed Bearings 1-1/8″ to 1.5″ Tapered Steerer Top Nut: 1-1/8″ Cup O.D.: 44/55 Crown Cone: 39.8 Height: 19.8 HRK2Cup O.D.: 44/56 Technical Diagram - HRK1 Technical Diagram - HRK2