Headset for tapered steerer tube forks, used in tapered headtube frames 7.8mm carbon top cover Designed for tapered steerer FSA Part number 121-0466A HEADSET TYPE: Threadless Integrated STEERER TUBE: Tapered 11/8" to 1.5" MATERIAL: Carbon top cover 7.8mm STACK HEIGHT: 9mm UPPER BEARING: 45° x 45° 11/8" ACB Sealed Bearing 41.8mm OD LOWER BEARING: 36° x 45° 1.5" ACB Sealed Bearing 51.8mm OD