Specialized Complete Integrated Headset Description: Meant to replace headsets found on select Specialized models; this assembly is complete with 1-1/8" upper and 45.8mm OD lower bearing for non-Future Shock equipped alloy Diverge model bikes with a 1-1/8" steerer fork. Features: Complete Headset assembly for Specialized Diverge Includes: Upper Bearing: 41.8mm OD x 30.5mm ID x 8mm Thick (45x45 degree) Lower Bearing: 45.8mm OD x 36.8mm ID x 6.5mm Thick (45x45 degree) 46mm OD / 15mm tall plastic top transition cover Split plastic compression ring, 7mm tall 5mm plastic headset spacer (2 pcs.) 10mm plastic headset spacer (1 pcs.)