Not all 16-notch bottom bracket cups are the same size, which is why Park Tool makes multiple tools for the same notch count. The BBT-29 Bottom Bracket Tool covers 2 of those sizes in a single double-ended wrench: one end fits 16-notch cups with a 39mm outer diameter, and the other fits 16-notch cups with a 48.5mm outer diameter. If you're working on Shimano Dura-Ace BB9000, XTR BB93, FSA MegaEvo, or Wheels Manufacturing thread-together bottom brackets, this is the tool that matches the cup interface.

The 39mm end handles the smaller-diameter cups found on Shimano's Dura-Ace 9000/R9100 series and XTR M9000 series bottom brackets, along with Token models that share the same 16-notch, 39-40mm major diameter fitting. The 48.5mm end picks up the FSA MegaEvo and several Wheels Manufacturing thread-together models including the T47, PF30, BB-BSA30, BBRIGHT-OUT, BB86-OUT, PF30-THD, PF30-FAT, BB86-FAT, and 386EVO. Having both ends on one tool means you don't need separate dedicated wrenches for each cup diameter.

The handle is plated steel with enough length to deliver leverage on high-torque applications, which matters since bottom bracket cups are torqued to anywhere from 35-50 Nm depending on the manufacturer's spec. The center of the tool body includes M15 threading, which lets you thread the BBT-29 into the bottom bracket's spindle bore and pair it with a Park Tool BBT-RS Bottom Bracket Tool Retaining System. That retaining setup keeps the tool fully engaged with shallow notch fittings during removal, which is where stripped cups and slipped tools usually happen.... Read More