Park Tool Bottom Bracket Tool - Hollowtech II - BBT-9 The bbt-9 is used to remove and install shimano hollowtech One end of the BBT-9 securely engages the 16 notches of the bottom bracket cups BBT-9 works with many external bearing crankset bottom brackets, including: Shimano Hollowtech II,Campagnolo Ulta-Torque and Power Torque The BBT-9 works with many external bearing crankset bottom brackets, including: Race Face, FSA, SRAM, Truvativ, Chris King