Cane Creek 40 Series HeadsetsReplaces Cane Creek XXc Flush and XXcII Flush headsetsZero Stack (ZS) assemblies feature press-in cups with bearings inside 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 UpperZS49,28.6S.H.I.S LowerZS49S.H.I.S. Clamp Diameter28.6