The 10-Series uses economical bearings, a split crown race, and simpler machining in the cups than Cane Creek's higher end headsets, but shares the same internal geometry so replacement parts can be upgraded. External cups press directly into head tube. Features-Compatible with Cane Creek Interlok spacers-Black oxide bearings-Split glass-reinforced polyamide crown race-Compatible with straight steerer 1-1/8" forks Item Specifications-Color:Black-Weight:88.29-Crown Race:30-Bearing Type:Cartridge-Defined Color:Black-S.H.I.S Upper:EC34-S.H.I.S Lower:EC34-S.H.I.S. Stem Clamp Diameter:28.6 Threadless-Lower Stack Height:12-Upper Stack Height:16