Park Tool, BBT-79.3, Bottom Bracket Tool, External type

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Fits 12-notch threaded bottom bracket tool fittings with a major diameter (outside of notches) of 45–47 mm and a minor diameter (inside of notches) of 44 mm, including: SRAM® BSA D UB® Race Face® Cinch® Rotor® BSA30 Zipp® Vuma™ Hawk Racing™ BB3086™ and more 3/8" drive fitting Integrated threads for full compatibility with the Park Tool BBT-RS Bottom Bracket Tool Retaining System (sold separately) Show more