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

The BBT-18 is a heavy duty, investment cast tool for installing and removing the following:

BBT-18 Features:

• 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
• 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