Cane creek 10 series zs44 zerostack headsetthe 10 series has the look and feel of cane creeks class leading 40 series headsets with simpler machining and more economical materials designed with the upgrade path in mind the 10 series shares the internal geometry of cane creeks higher end headsets and as a result replacement and upgrade parts are readily available features steerer tube od 1 18 upper head tube id 44 00mm lower head tube id 44 00mm fork crown seat od 30 015mm total stack