Park Tool Bottom Bracket and Lockring Tool - 8-Notch BBT-18

The BBT-18 is a heavy duty investment-cast tool for removing and installing components with an eight-notch tool fitting, including select cartridge bottom brackets, as well as chainring lockrings on some e-bike drivetrains.

• Installs and removes the following components with eight-notch tool fittings:
• Shimano Octalink drive-side bottom bracket cups with external notches
• ISIS Drive bottom bracket cups including Truvativ and Bontrager
• Front chainring lockring for Bosch Gen 3 and Gen 4 e-bike systems
• Front chainring lockring for Specialized Levo Brose e-bike systems
• Tool specifications:
• 8 notches with a nominal outside diameter of 43.4 mm
• The hole in the center of the casting is 22.5 mm, and will not fit over 30 mm spindles
• Features 36 mm wrench flats