Home » headsets » Tapered Headsets » p506a-1 TAPERED HEADSETS P506A-1 ZS44/28.6 I EC44/40 Alloy, Sealed Bearings 1-1/8″ to 1.5″ Tapered Steerer Top Nut: 1-1/8″ Cup O.D.: 44 Crown Cone: 39.8 Height: 14.9 Technical Diagram