r554a-1 Home » headsets » internal cable routing » r554a-1 INTERNAL CABLE ROUTING HEADSET R554A-1 IS52/28.6 I EC49/40 Alloy Cap/Cup Sealed Bearings 1-1/8" to 1.5" Tapered Head Tube & Steerer Compatible with ENVE's IN-Route Stem Top Nut: 1-1/8 Bearing O.D.: 52/49.6 Crown Cone: 39.8 Height: 22.8 Weight: 141g Technical Diagram