Home » headsets » Tapered Headsets » p506a TAPERED HEADSETS P506A ZS44/28.6 | ZS56/40 Alloy Cap/Cup Sealed Bearings 1-1/8″ to 1.5″ Tapered Head Tube & Steerer Cup O.D.: 44/56 Top Nut: 1-1/8″ Crown Cone: 39.8 Height: 4.9 Weight: 109g Technical Diagram