Specialized factory replacement individual headset bearing featuring a 45Adegx;45Adeg interface, designed for frames and forks that require a 1.5-inch lower headset bearing with this specific geometry. Specifications Bearing Type: MH-P16 Interface: Campy Style - 45Adeg x; 45Adeg Outer Diameter (OD): 52mm Inner Diameter (ID): 40mm Thickness: 7mm Material: Steel Quantity: Single bearing Features Genuine Specialized factory replacement part Precision 45Adeg x; 45Adeg contact angles for proper headset alignment Smooth rotation and long service life Designed to meet original OEM headset tolerances Ideal for replacement of worn or damaged lower headset bearings