FSA No. 63/51 Semi Integrated 1.1/8 - 1.25" 44.6/49.6mm Headset

1.1/8 - 1.1/4", 45×45° ACB For tapered 51.2/56.2mm OD head tube For 1.1/8" to 1.1/4" tapered fork Alloy top cover Angular Contact Bearing (black seal) Stack height: 17.5 + 3 = 20.5mm Weight: 109.4g

FSA No.55R/44 Semi-Integrated 1.1/8 - 1.8" 44.0mm SUPTAP Headset

For use with 44mm OD stems. For tapered 62/72mm OD headtube. For 1.1/8" to 1.8" tapered fork. Angular Contact Bearing (Black Seal). Headtube ID: 56mm upper, 66mm lower.