ACB 3645 CC SXD | 30.2 x 41 x 6.5 mm | 36 x 45deg | Headset Bearing

ACB 3645 CC SXD - 1-1/8 Angular Contact Headset Bearing (30.2mm x 41mm x 6.5mm: 36x45 deg) - Internal headset bearing featuring XD15 races and balls to provide a lifetime corrosion resistanceThe last headset bearing you will ever install into your bike. , These full XD15 bearings are virtually identical in performance and corrosion resistance to our XD15 Ceramic-hybrid bearings used for hubs and bottom brackets, but with XD15 balls that work better in the more abusive steering environment. The mechanical properties of XD15 stainless steel balls provide a level of impact resistance superior to ceramic balls for headset application. Enduro testing of bearings with XD15 balls and races have been run salt water for months without any corrosion, there is simply nothing on the market that compares. We are so confident in this material that we guarantee these full XD15 headset bearings for life, against corrosion.This size bearing is also known in the bike Industry by these part numbers:, 27287-1046-004, HSS 20130K, TH-873E, MR-122The Enduro line of angular-contact headset bearings start with Black Oxide treated Chromium Steel races, steps up to full 440C stainless steel, and the top of the line is, lifetime-guaranteed, XD15 aerospace-stainless (races and balls). They are always engineered with the largest balls possible, feature dual-lip seals riding in a micro-groove (labyrinth) and are filled 90% with high pressure water proof grease for the ultimate protection against sweat and the elements. Enduro Angular Contact (A/C) bearings are designed so all balls are evenly engaged to spread the force over a larger surface area, minimizing wear and maximizing life.