Bottom bracket: The bearing system which the pedals (and cranks) rotate all around. Consists of a spindle to which the crankset is connected plus the bearings them selves. You will find a bearing floor on the spindle, and on Just about every of the cups that thread into the frame. https://raymondodoxj.aboutyoublog.com/39657596/about-trikes-with-a-predator-engine