The BBT-9 works with many external bearing crankset bottom brackets, including: Shimano® Hollowtech II® Campagnolo® Ultra-Torque™ and Power Torque™ Race Face® FSA® SRAM® Truvativ® Chris King® Phil Wood® outboard bearing Hawk Racing Token® Fulcrum® The BBT-9 also fits rotor disc lockrings which use 16 external notches.