Product Description Upper head tube ID: 44mm (semi integrated) lower head tube ID: 54.92mm for 1.1/8" to 1.5" tapered steered features: 1.1/8" upper, 1.5" lower for different od head tube for tapered 50 - 61mm od head tube for tapered fork steered 1.5" to 1.1/8" upper: forged alloy shallow cup with 36 x 45 acb lower: CNC machined alloy cup with 1.5" 36 x 45 acb stack height: 18.7 + 2.4 = 21.1mm weight: 110g spares: upper bearing: 160-6460 lower bearing: 160-6470 crown race: 160-5537 Box Contains 1 x Headset
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