External English (BSA) threaded bottom bracket for 73mm shells. Enduro bearings and silicone seals for the most durable and smoothest bottom brackets available. Fully serviceable. Features: Includes replacement dust covers and seals CNC-machined aluminum shell for precise bearing alignment and frame fit Replaceable Enduro bearings (2437) Made in the USA ABEC-5 Angular Contact sealed bearings Angular contact ball bearings are particularly suitable for carrying combined axial and radial loads Includes replacement dust covers and seals Installs with Shimano TL-FC32 or the Park BBT-9 tool 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, 73mm Color: Black Weight: 96g