Cane Creek 50-Series headsets bring a new modern aesthetic while maintaining a relatively affordable price. Additional machining on the top cover and cups along with refined laser-etched graphics give the headset a sharper more angular appearance that feels more appropriate for today&';s bikes. The 50 is a fantastic upgrade to increase the peace of mind that comes with a quiet tight and smooth-riding bike. 6061-T6 Aluminum cups and covers are internally relieved to minimize weight and maximize strength Features a steerer tube o-ring seal low friction top cover lip seal and co-molded crown race lip seal to provide protection from contaminants Steel forged and machined crown race offers increased hardness and durability ZN40 sealed cartridge bearings are zinc-coated for corrosion resistance Carbon friendly captured compression ring InterlokA(R) spacer compatible (Sold Separately) For use with tapered 1 1/2" steerer tubes and tapered 44mm/56mm head tubes. SPECS Lower Stack Height 4 Material Steel Upper Stack Height 8 S.H.I.S Upper ZS44 S.H.I.S. Stem Clamp Diameter 28.6 Threadless S.H.I.S Lower ZS56 Color Black Crown Race 40 Bearing Type Cartridge Defined Color Black Stack Height 12 Upper Type ZS44/28.6/H8 Lower Type ZS56/40 Tapered