BB B 543 2RS A/C | 1-1/16 x 1-1/2 x 9/32 inch | Headset Bearing

B 543 2RS AC - 1-1/2" - Angular Contact Headset Bearing (Cannondale Lefty) 1-1/2 Angular Contact Bearing for Internal Headset featuring 52100 High-Carbon Chromium alloy races paired with grade 10 Balls. (Cannondale Lefty) 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.