Home » headsets » Tapered Headsets » p561s TAPERED HEADSETS P561S ZS44/28.6-26tpi | ZS56/40 Steel Ball Retainers 1-1/8″ to 1.5″ Tapered Head Tube & Steerer Top Nut: 25.4 Cup O.D.: 44/56 Crown Cone: 39.8 Height: 21.1 Technical Diagram