FSA Gravity 4 Tapered Steerer Headset: For 55mm OD headtube. 1.5" to 11/8" tapered steerer 20mm headtube insertion CNC machined steel cups Upper: &216;7/32" &215; 20 caged ball bearings Lower: &216;1/8" &215; 30 caged ball bearings Stack
Height: 17 + 2.7 = 19.7mm Weight: 323g