Park Tool BBT-69.4 16-Notch External Bike Bottom Bracket Cup 44-45mm 3/8" Drive Description New Park Tool BBT-69.4 16-Notch, 44-45mm Diameter External Bottom Bracket Tool Compatibility: 3/8" drive Product InforFits 16-notch tool fittings with a major diameter (outside of notches) of 44–45 mm and a minor diameter (inside of notches) of 42.7 mm, including: Shimano® BB80, BB5700, XT® BB70, BB51, and previous external bearing threaded bottom bracket cups Threaded bottom bracket cups from Campagnolo®, Chris King®, FSA® MegaExo®, Hope™, SRAM®/Truvativ® GXP®, Race Face® X-type, Surly®, Wheels®, Fulcrum®, and others Center lock disc brake rotor lockrings Bafang BBSH, BBS02 mid-drive motor lockrings