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

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.

BBT-18 Features

• 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, Gen 4, and Gen 5 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.
• Park Tool homepage provides a bottom bracket tool finder for a broad variety of models.