Home » headsets » internal cable routing » c660a-2 INTERNAL CABLE ROUTING HEADSET C660A-2 WATERPROOF ZS66/28.6 | ZS66/40 Alloy, Sealed Bearings 1-1/8" to 1.5" Tapered Steerer Top Nut: 1-1/8" CUP O.D.: 66 Crown Crown: 39.8 Height: 11.2 Technical Diagram