Semi Integrated Tapered Headset 1 1/8" - 1 1/2"The Jitsie semi integrated tapered headset is compatible with frames with a conical 1 1 8" 1. 5" size headset tube. Features:* top side ZS44 28. 6 (head tube inside diameter: 44mm steering tube diameter: 28. 6mm)* bottom side ZS56 40 (head tube inside diameter: 56mm crown race seat diameter: 40mm)* manufactured from high quality aluminium* sealed quality bearing for long life usage* focus on minimal weight* black anodised finish with Jitsie logos*