Bottom bracket tools need to match the specific interface you're working with, and the BBT-32 handles Shimano and ISIS Drive external bearing cups. The 16-notch pattern fits the splined ring on external bottom brackets from Shimano's Hollowtech II system as well as ISIS Drive cranks from manufacturers who adopted that standard. You'll need this specific tool because the notch count and diameter differ from other external bottom bracket interfaces.

The tool fits a 3/8" drive ratchet or torque wrench, which matters when you're installing cups to spec. Shimano calls for specific torque values on their bottom bracket cups, and using a torque wrench with this tool lets you hit those numbers rather than guessing. The 20mm hex center accepts a wrench for additional leverage when cups are seized or when you need more control during removal.

Park Tool machines the BBT-32 from steel and finishes it with a black oxide coating that resists corrosion. The notches engage the cup splines cleanly without the slop you get from cheaper stamped tools, which prevents rounding the interface on stuck cups. This matters most during removal when corrosion or thread compound has bonded the cup to the shell.... Read More