FSA #57 Headset ZS44-56

SPECSHEADSET TYPE: Threadless Zero Stack CupSTEERER TUBE: Tapered 11/8" to 1.5"MATERIAL: AlloySTACK HEIGHT: 12.8mmUPPER CUP: 44mm Flush CupLOWER CUP: 56mm Flush CupUPPER BEARING: 36° x 45° 11/8" ACB Sealed Bearing 41.0mm ODLOWER BEARING: 36° x 45° 1.5" ACB Sealed Bearing 51.8mm OD