BBT-18 Bottom Bracket Bike Tool for 8-Notch ISIS Cups

The BBT - 18 features 8 notches with an outer diameter of about 43.4mm and an inner - to - inner width of around 38mm. Each notch is roughly 3.9mm wide. The central hole in the casting is 22.5mm, so it won't fit over 30mm spindles. It can work with a 36mm crowfoot (like the TWB - 36) or an open - ended wrench. This heavy - duty, investment - cast tool from Park Tool is great for installing and removing Shimano® Octalink® right - side bottom bracket cups with external notches, Bontrager® ISIS Drive™ bottom bracket cups, and front chainring lockrings for Bosch® Gen 3 and Gen 4 e - bike systems and Specialized® Levo® Brose® e - bike systems.

How to use: First, choose the right accessory like a 36mm crowfoot or an open - ended wrench to pair with the BBT - 18. Then, place the tool correctly on the bottom bracket cup or chainring lockring you want to install or remove and apply appropriate force. Note: Since the central hole of the tool is 22.5mm, it won't fit 30mm spindles, so make sure to check the size before use. Maintenance: After each use, clean the tool with a dry cloth to keep it free from dirt and debris. You can also apply a little lubricant occasionally to keep it working smoothly.