Home » headsets » Semi Integrated Headsets » r56 SEMI-INTEGRATED HEADSETS R56 ZS56/28.6 I ZS56/30 +/-5mm Alloy Cap/Cup Sealed Bearings Reach Adjust +/-5mm Top Nut: 1-1/8" Cup O.D.: 56 Crown Cone: 30 Height: 12.6 Technical Diagram