According to the user manual: The headset uses a 1 1/8" (41.8 x 30.5 x 8mm, 45 x45 degree) Campagnolo Standard compatible upper bearing and a 1.5" (52mm x 40 x 7mm, 45x45 degree) lower bearing. No tools are needed for installation or removal of both bearings. Grease bearing surfaces before...