Neco 1-1/8" to 1.5" Tapered Fork 44mm Head Tube Bike Conversion Headset ZS44/28.6 EC44/39.8 Use for 44mm Head Tube and 1-1/8" to 1.5" Tapered Fork Headtube ID.: 44mm Crown Race: 39.8mm SHIS NORM: ZS44/28.6 | EC44/39.8