Home » headsets » Threadless Headsets » p502a-344 THREADLESS HEADSETS P502A-344 ZS44/28.6 | EC44/40 Alloy Cap/Cup Sealed Bearings 1-1/8″ to 1.5″ Tapered Steerer Top Nut: 1-1/8″ Cup O.D.: 44 Crown Cone: 39.8 Height: 16 Technical Diagram