ZRACE BSA 24mm Bottom Bracket Aluminum CNC BB51 BB52 BB70 BB83

ZRACE BSA 24mm Bottom Bracket Engineering and Specifications

Precision CNC machining creates perfectly centered bearing surfaces that eliminate play and reduce friction throughout your drivetrain rotation cycle. The lightweight aluminum construction saves measurable weight compared to steel alternatives while maintaining rigidity under hard pedaling forces. Multiple BB sizes—BB51, BB52, BB70, and BB83—let you match your existing frame’s threading standard without compromise. Sealed bearing cartridges resist moisture and dirt ingress, extending service intervals on any terrain from pavement to mud. Full compatibility with both Shimano and SRAM cranksets means this bottom bracket integrates seamlessly into your upgrade project.