Cane Creek 10-Series ZS Set Short Black 1-1/8"-44mm Head-Tube ZS44/28.6|ZS44/30Cane Creek 10 Series Complete Headset ZS44 28. 6mm Upper with Short Top Cover and ZS44 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. Zero Stack cups press into the headtube with a very low stack height. Black oxide bearings Split glass reinforced polyamide crown race