Park Tool BBT-18 Bottom Bracket Tool

The Park Tool BBT-18 Bottom Bracket Tool has 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 the 30mm spindles. It can be used with a 36mm socket or open-ended wrench. The BBT-18 is a heavy-duty, investment cast tool for installing and removing the following eight-notch bottom bracket cups:

• Shimano® Octalink® right cup with external notches
• ISIS Drive™