Park Tool BBT-9 Bottom Bracket Tool
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The BBT-9 fits cups and lockrings with 16 external notches and an outside diameter of about 44mm. Also fits rotor disc lockrings that use 16 external notches.
- Tough 2-sided tool for crankset bottom brackets
- One end securely engages cup's 16 notches
- Other end engages 8 splines of adjustment cap
- Works with many external bearing cranksets