MainDrive Integrated Headsets feature CNC machined alloy tops with 45/45 degree sealed mechanism retainer bearings.Crown Race:30S.H.I.S. Stem Clamp Diameter:28.6 ThreadlessBearing Type:CartridgeS.H.I.S Lower:IS42S.H.I.S Upper:IS42
MainDrive Integrated Headsets feature CNC machined alloy tops with 45/45 degree sealed mechanism retainer bearings.
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