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The FSA SX Pro No.55 Semi Integrated Headset is for tapered 50mm/61mm OD head tube with forged alloy and CNC machined upper and lower cups.1.1/8" / 1.5", 36°×45° ACBFor tapered 50mm / 61mm OD head tubeFor 1.1/8" to 1.5" tapered forkForged alloy upper cup with CNC machined alloy lower cupUpper: 36°×45° ACB (blue seal)Lower: 1.5" 36°×45° ACB (black seal)Stack height: 18.8+2.4=21.2mmWeight: 110.2gSparesTop Bearing: TH873E (160-0014000000)Bottom Bearing: TH073E (160-6761)Crown Race: H6078 (160-5537)