The Wheels Manufacturing Shimano Threaded Bottom Bracket with Angular Contact Bearings features machined aluminum bearing cups to thread in to standard BSA frames. Features: Includes replacement dust covers and seals CNC-machined aluminum shell for precise bearing alignment and frame fit 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: BSA/English Threaded Spindle Interface: 24mm (FSA MegaExo, RaceFace EXI, Shimano Hollowtech II) Bottom Bracket Shell ID: 1.37 Shell Width: 68mm Material: Aluminum Shell Color: Grey Weight: 96g