Park Tool Bottom Bracket Tool (BBT-9)

The Park Tool Bottom Bracket Tool BBT-9 is used to remove and install external bearing crankset bottom brackets. One end of the BBT-9 securely engages the 16 notches of the bottom bracket cups. The other end of the tool engages the 8 internal splines of the crank arm adjustment cap. The BBT-9 fits cups and lockrings with 16 external notches and an outside diameter of approximately 44mm.

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.