The 40-Series is the workhorse of Cane Creek's headset line-up. Representing the balance of performance, durability, and value, the series incorporates all the features necessary for a robust, lightweight, long-lasting headset. Zero stack uppers press into head tube with very little stack height. - Sealed black oxide bearings - Carbon-friendy compression ring captured in top cover, keeping shims in place - Steel crown race with integrated seals - Interlok spacer compatible - Compatible with straight steerer 1-1/8" forks - Bearing Type: Cartridge - Color: Black - Defined Color: Black - Weight: 171 g -Upper Stack Height: 8 mm - Lower Stack Height: 12 mm - Crown Race: 30 - S.H.I.S Lower: EC44 - S.H.I.S Upper: ZS44 - S.H.I.S. Stem Clamp Diameter: 28.6 Threadless