Threadless headset Enduro Bearings 1-1/8" Black Oxide

HDK-0007 is a threadless headset bearing kit for 1-1/8" forks and framesets with a 34mm (1 1/8) ID head tube. It is intended for a 28.6 mm steerer; the listed dimensions are 28.6/34/30 mm. The kit includes aluminum cups, sealed Black Oxide bearings, a fork crown race, an upper split ring and a cap.

The kit removes the external headset bearing cup, allowing the bearing to press directly into the frame’s head tube. The bearings have anti-corrosion Black Oxide/Magnetite-coated 52100 high-carbon chromium alloy races and grade 10 balls. Dual-lip labyrinth (LLB) seals protect against the elements and retain the waterproof, high-pressure synthetic Mobil XHP 222 grease, which fills 90% of the bearing. The Black Oxide coating provides additional corrosion resistance.

The Enduro headset bearing line starts with chromium steel, a Black Oxide finish and A/C-type construction, and extends to fully 440C stainless steel bearings at the top of the line. The bearings are engineered with the largest possible balls and dual-lip seals running in a micro-groove to protect against sweat and the elements. They are filled 90% with waterproof, high-pressure grease. Enduro Angular Contact (A/C) bearings are designed so that all balls are evenly engaged, distributing force over a larger surface area and reducing wear.