Park Tool BBT-90.3 PressFit Bottom Bracket Bearing Tool SetThe BBT 90. 3 Press Fit Bottom Bracket Bearing Tool Set is designed for installation and removal of bearings and bearing units used in BB90, BB92, Shimano press fit, SRAM press fit GXP, Race Face press fit and other press fit bottom bracket systems using 24mm or 22mm spindles. The BBT 90. 3 includes a bearing removal tool and two bushings, which are used in conjunction with a Park Tool Bearing Press to press the bearings into the bottom bracket shell.