Home » headsets » Tapered Headsets » rk7 TAPERED HEADSET RK7 ZS44/28.6 I ZS56/40 Alloy, Sealed Bearings 1-1/8" to 1.5" Tapered Head Tube & Steerer Top Nut: 1-1/8" CUP O.D.: 44/56 Crown Crown: 39.8 Height: 23.1 Technical Diagram