The BBT-18 is a heavy duty, investment cast tool for installing and removing the following eight-notch bottom bracket cups:
- Shimano Octalink right 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
Constructed from investment-cast steel and featuring 36mm wrench flats. The BBT-18 has 8 notches with a nominal outside diameter of 43.4mm. The hole in the center of the casting is 22.5mm, and will not fit over 30mm spindles. Manufactured by Park Tool, the most trusted name in bicycle tools and repair equipment for over 50 years.