Bottom bracket: The bearing system which the pedals (and cranks) rotate close to. Has a spindle to which the crankset is connected along with the bearings them selves. There exists a bearing surface area around the spindle, and on Every from the cups that thread into the frame. In the https://bikeenginetypes94726.blog-kids.com/35206909/a-review-of-bob-mills-lift-chair