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