Cane Creek 40 Series HeadsetsReplaces Cane Creek S-3 headsetExternal Cup (EC) assemblies feature press-in cups with bearings outside the frameReplaces Cane Creek ZS-3 headsetBlack oxide, sealed cartridge bearingsZS44/28.6|ZS44/30 fits 1-1/8" straight steerer tubes to straight 44mm (1-1/8") head tubesInternally relieved AL-6061 T-6 cups and coversZero Stack (ZS) assemblies feature press-in cups with bearings inside the frame8mm stack height (short) top coverItem SpecificationsColorBlackSteerer Tube1-1/8" ThreadlessCrown Race30.0Stack Height16mmBearing TypeSealedDefined ColorBlackS.H.I.S UpperEC34S.H.I.S LowerEC34S.H.I.S. Clamp Diameter28.6