Cane Creek 40 series Bottom AssembliesReplaces Cane Creek XX-44 headsetBottom assemblies include bottom cup, sealed oxide bearing, and crown raceEC44/40 Conversion Bottom fits 1-1/8" 44mm standard head tube bottom (44mm inner diameter)Consistent stack heights across 10, 40 and 110 SeriesFor use with 1.5" threadless steerer tube bottom (40mm crown race seat diameter, tapered steerer tube)Internal parts are cross-compatible across 10, 40 and 110 seriesConverts 44mm head-tube bottom for use with 1.5" 40mm crown race forksDurable steel crown race with low-friction face-sealsExternal Cup (EC) 44mm Bottom Assembly enables use of tapered steerer tubeExternal Cup (EC) assemblies feature press-in cups with bearings outside the frameCombine with 44mm 1-1/8" ZeroStack Top Assembly for complete 44mm straight head-tube installationInternally relieved AL-6061 T-6 cupAssembly includes 1.5" black oxide steel bearing and 40-Series 1.5" crown raceItem SpecificationsColorBlackWeight76gMaterialAluminumSteerer Tube1.5"Crown Race39.7Stack Height12mmBearing TypeBlack Oxide SealedS.H.I.S LowerEC49