Park Tool Bottom Bracket Hollowtech II Tool (BBT-9)
The 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:
The BBT-9 also fits rotor disc lockrings which use 16 external notches. Made in the U.S.A.