FSA Gravity DX ZS 11/8" Headset: For tapered 55mm / 57mm OD headtube. 11/8", 36&176; &215; 45&176; ACB Alloy upper cup with Angular Contact Bearings (blue seal) Forged alloy lower cup with 1.5" Angular Contact Bearings (black seal) Stack
Height: 6.3 + 13.4 = 19.7mm Weight: 155g