Machined aluminum shell threads together for precise bearing alignment and frame fit, reducing bottom bracket creaking and premature bearing wear. Features: Replaceable Enduro bearings Made in the USA ABEC-5 Angular Contact sealed bearings Angular contact ball bearings are particularly suitable for carrying combined axial and radial loads Specifications: Frame Interface: BB30 Spindle Interface: 24mm (Shimano Hollowtech II, FSA MegaExo, FSA MegaExo Light, RaceFace EXI) Bottom Bracket Shell ID: PF42 Shell Width: 68mm, 73mm Color: Black Weight: 127g