Designed to bridge the gap between the 40 and 110-series headsets Contoured and relieved 6061-T6 aluminum for minimized weight and maximized strength Low-friction upper bearing seal completely seals cup from contaminants and is fully captured by the top cover with no loose parts. Premium, sealed stainless-steel Hellbender bearings Dual-Seal crown race provides excellent seal efficiency with low friction Carbon friendly compression ring and Interlok spacer compatible Lower Stack Height 1, 12, 4 Material Stainless Steel Upper Stack Height 8, 9 S.H.I.S Upper IS41, IS42, ZS44, ZS56 S.H.I.S. Stem Clamp Diameter 28.6 Threadless S.H.I.S Lower EC44, IS52, ZS56 Color Black, Purple, Silver Crown Race 40 Bearing Type Cartridge Defined Color Black, Purple, Silver Stack Height 10, 12, 20
