The Wheels Manufacturing Road External Steel Bottom Bracket with Angular Contact Bearings for SRAM/GXP Road Cranksets uses machined aluminum bearing cups to thread into 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: SRAM/Truvativ GXP (24/22mm) Bottom Bracket Shell ID: 1.37 Shell Width: 68mm Material: Aluminum Shell Color: Grey Weight: 98g