Home » headsets » Integrated Headsets » rb2-rb3 INTEGRATED HEADSETS RB2 | RB3 IS42/28.6 | IS42/30 Nylon Cap Sealed Bearings ACB 45° x 45° Top Nut: 1-1/8″ Bearing O.D.: 41.8 Crown Cone: 30 Height: 16.4 (RB2) Height: 16.7 (RB3) Technical Diagram - RB2 Technical Diagram - RB3