Park Tool BBT-18 Bottom Bracket Tool, click to enlarge
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Item # BBT-18

/ Tools / Crank & Bottom Bracket / E-Bike

Bottom Bracket and Lockring Tool — 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.

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BBT-18 Features

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

Product Fitment

Below is a filterable table of bottom bracket models the BBT-18 is compatible with. For a full list of tool compatibility, see our Bottom Bracket Tool Finder.

Truvativ® Threaded ISIS Drive and Giga Pipe™

Parts & Accessories


Bottom Bracket Tool Retaining System

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