Description The Park Tool Bottom Bracket Tool BBT-32 is a 20-Spline or 20-Notch Shimano/ISIS compatible BB tool. Bottom brackets occasionally require removal for service, replacement, or upgrading. The BBT-32 is compatible with bottom brackets with 20 splines and a diameter of 32 mm. This fitting is found on many models of cartridge bottom brackets, including Shimano®, Truvativ®, RaceFace®, FSA®, and others. Also fits some models of crankset lockrings including Race Face®. The tool clears the oversized spindles of ISIS Drive and Octalink® cranksets. Can be driven using an adjustable wrench or 32 mm socket. Park Tool Bottom Bracket Tool BBT-32 Features & Specs Fits tool fittings with 20 splines and a diameter of 32 mm, including: Shimano Truvativ Race Face FSA and others Also fits some models of crankset lockrings including Race Face.