Precision-engineered ABEC-5 Angular-Contact bottom bracket bearing constructed with 440C stainless steel races and balls. Features 90% fill, high-pressure waterproof grease for superior corrosion protection. Enduro's Angular Contact design distributes force across all balls when correctly installed (black seal facing inward), effectively managing the changing lateral loads that typically cause premature BB failure. This load distribution significantly extends bearing life by reducing localized wear in demanding cycling applications.

Not all stainless steel is created equal.

Engineered with premium 440C stainless steel balls and races, these bearings deliver exceptional durability and corrosion resistance in challenging conditions. This high-carbon stainless variant offers superior strength, hardness, and wear resistance compared to other 440-series alloys, achieved through sophisticated multi-stage heat and cryogenic treatments. While carrying approximately 20% less load capacity than standard 52100 chromium steel bearings, these stainless components excel in wet environments, frequent washing scenarios, and applications where sweat exposure is common, making them an optimal choice for demanding cycling applications.

This precision bearing serves primarily as a direct replacement component for high-performance bottom bracket systems utilizing 30mm outer diameter spindles, including BB30, PF30, BB386, and similar configurations. Its specialized dimensions and engineering make it the standard solution for maintaining optimal drivetrain performance across multiple bottom bracket standards in the premium cycling segment.