The BB90 (road) and BB95 (mountain) are Trek's own internal bottom bracket. The bearings press directly into the frame and can be configured to run Shimano (24 mm HT2), Truvativ/SRAM (24/22 mm GXP) or FSA (24.1 mm MegaExo) cranksets. Browse bearing kits below or select your cranks at left to view suitable bearing kits.