Home » headsets » Tapered Headsets » r56-1 TAPERED HEADSETS R56-1 ZS56/28.6 I EC56/40 +/-5mm Alloy Cap/Cup Sealed Bearings Reach Adjust +/-5mm Top Nut: 1-1/8" to 1.5" Cup O.D.: 56 Crown Cone: 39.8 Height: 22.6 Technical Diagram