ACB 4545S8551 BO Bike Angular Contact Ball Bearing Black Oxide

Angular contact bearings provide maximum load distribution across all of the ball bearings unlike standard bearings which load only those at the bottom of the bearing. This load distribution ensures bearing life is increased drastically allowing for more time spent in the saddle than the workshop

Ball Grade: Grade 5

Material: 52100 High Carbon Chromium Alloy

Black Oxide Raceways which get an additional Magnetite treatment for hardness, rust resistance and greater reliability

Outer Chamfer 45 degrees, Inner chamfer 45 degrees

Application: Headsets