HDK-0007 - 1-1/8 Black Oxide, Angular Contact, External Bearing Kit for 34mm (1 1/8) ID head tube framesets This headset utilizes 45º inner race chamfer angles for upper bearing, lower bearing, compression ring, and crown race.This unique bearing kit eliminates the external headset bearing cup and provides a simple low profile solution where the bearing itself presses directly into the head tube. The kit includes fork crown race and upper split-ring and cap. These bearings feature anti-corrosion Black Oxide/Magnetite treated 52100 High-Carbon Chromium alloy races paired with grade 10 Balls, dual-lip labyrinth (LLB) seals to withstand the outside elements, and to contain the 90% fill Mobil XHP 222 high pressure water proof synthetic grease. Black Oxide treatment provides an extra level of corrosion resistance and extended worry-free performance. The Enduro line of headset bearings begin with chromium steel, Black Oxide finish A/C type and then offer full 440C stainless steel at the top. They are always engineered with the largest balls possible and dual lip seals riding in a micro-groove for ultimate protection against sweat and the elements. They are filled 90% with high pressure water proof grease, so you never have to guess if there is grease inside. Enduro Angular Contact (A/C) bearings are designed so all balls are evenly engaged to spread the force over a larger surface area, pressure water and minimizing wear.Total stack is 21mm (11mm upper and 10mm lower)
