Home » headsets » Tapered Headsets » d40f-8 TAPERED HEADSETS D40F-8 IS42/28.6 I IS60/40 Alloy, Sealed Bearings 1-1/8″ to 1.5″ Tapered Head Tube & Steerer Top Nut: 1-1/8″ Bearing O.D.: 41.8/60 Crown Cone: 39.8 Height: 16.4 Technical Diagram