Home » headsets » Threadless Headsets » pz-344a THREADLESS HEADSETS PZ-344A EC34/28.6 | EC44/40 Alloy Cap/Cup Sealed Bearings 1-1/8″ to 1.5″ Tapered Head Tube & Steerer Top Nut: 1-1/8″ Cup O.D.: 34/44 Crown Cone: 39.8 Height: 31 Technical Diagram