Cane Creek 10-Series Ext. Cup Set Black 1-1/8"-34mm Head-Tube EC34/28.6|EC34/30Cane Creek 10 Series Complete Headset EC34 28. 6mm Upper and EC34 30. 0mm Lower Black. The 10 Series uses economical bearings a split crown race and simpler machining in the cups than Cane Creeks higher end headsets but shares the same internal geometry so replacement parts can be upgraded. External cups press directly into head tube. Black oxide bearings Split glass reinforced polyamide crown race Compatible with Cane Creek Interlok spacers TECH