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 installing and removing the following:

  • Shimano® Octalink® right side bottom bracket cup with external notches
  • Bontrager® ISIS Drive™ bottom bracket cups
  • Front chainring lockring for Bosch® Gen 3 and Gen 4 e-bike systems and Specialized® Levo® Brose® e-bike systems
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BBT-18 Features

  • 8 notches with an outside diameter of nominally 43.4mm
  • The inside-to-inside width is approximately 38mm
  • Each notch is approximately 3.9mm wide
  • The hole in the center of the casting is 22.5mm, and will not fit over 30mm spindles
  • Can be used with a 36mm crow foot (such as the TWB-36) or open-ended wrench

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