Bottom bracket: The bearing system that the pedals (and cranks) rotate all over. Contains a spindle to which the crankset is attached and also the bearings them selves. There exists a bearing floor over the spindle, and on each of your cups that thread into your frame. A bike made https://bikeenginecomparison82470.buyoutblog.com/34939260/considerations-to-know-about-predator-ghost-go-kart