PARK TOOL BBT-30. 4 BB BEARING TOOL SETBottom bracket bearings will wear out eventually and need to be replaced every so often. The BBT-30. 4 is a bottom bracket tool designed to remove and install bottom bracket bearings. It is designed to work with BB30, Press Fit 30, 386EVO, BBright, and PF121 bottom bracket systems. The BBT-30. 4 comes with two bushings that work with a head cup press to press in the BB30 and PF30 bearings into the bottom bracket shell. Features Removes multiple types of bearings like BB30, PF30, 386EVO, BBright, and PF121Includes two bushings that work with a head cup press | Park Tool | Bbt-30. 4 Bb Bearing Tool Set For Pf30, Bb30, Evo386, Pf121, Bbright