Headset bearing by FSA Bearing type: ACB. ID (inner diameter): 34 mm. OD (outer diameter): 46,8 mm. Height: 7 mm. IA (inner angle): 45°. OA (outer angle): 45°: 45°. Actual weight: 17 g. Type Headset bearing Manufacturer FSA Color Neutral Discipline ROAD, MTB Material Alloy, steel Weight (gr) 17.6 Dimension 1"-1/4 Bearing Type ACB Angle 45°x45°