Trek BB90 GXP BearingsInfo Installation Instructions Video Specifications JUST THE FACTS: BB90 is the mountain bike version of Trek's proprietary Direct in frame bottom bracket system. No cups or extra hardware required. With Trek BB90, the bearings press directly into the frame. Our Trek BB90 GXP bearings work with all GXP road bike crank systems from Sram and other manufacturers no matter how many chain rings you run. How do I know if my bike needs a Repair Kit or a
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