Park Tool BBT-179

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 DUB Race Face Cinch Rotor BSA30, Zipp Vuma, Hawk Racing BB3086 and more 50.04 mm (1.97'') outer diameter at point of engagement Internal clearance: 42 mm (1.654'') depth (from tool face) x 30.44 mm (1.198'') diameter Attributes Bottom Bracket Type 44mm/16 notch