Home » headsets » Threadless Headsets » pz-502a THREADLESS HEADSETS PZ-502A EC34/28.6 | ZS44/30 Alloy Cap/Cup Sealed Bearings 1-1/8″ to 1.5″ Tapered Head Tube Top Nut: 1-1/8″ Cup O.D.: 34/44 Crown Cone: 30 Height: 19.2 Technical Diagram