Cane Creek Z22 Zerostack Headset 1 1/8" BlackCane Creek Z22 Zerostack Headset 1 1/8" Black. The Zero Stack (ZS) design offers a low stack height, the security of bearing cups, and utilizes bearing cups that are hidden inside the head tube. ZS cups are compatible only with specifically machined head tubes and cannot be retrofitted ti an existing bike with traditional headset cups.
