Park Tool BBT-18 Shimano/ISIS bracket tool

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