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"BBRight uses the 11mm space occupied by an external bottom bracket’s left bearing cup to let the designer widen the frame tubes that connect to the bottom bracket shell: down tube, left. Their bottom bracket bearing arrangement was a "hybrid" - the right side was internal while the left side was external (and had the RS sealed bearing, too). Giga-X-Pipe [ . Find great deals on eBay for Bottom Bracket Shimano External Bearing. Shop with confidence.
The bottom bracket on a bicycle connects the crankset chainset to the bicycle and allows the crankset to rotate freely. It contains a spindle that the crankset attaches to, and the bearings that allow the spindle and cranks to rotate. The chainrings and pedals attach to the cranks. The bottom bracket fits inside the bottom bracket shellwhich connects the seat tubedown tube and chain stays as part of the bicycle frame. The term "bracket" refers to the tube fittings external bearing bottom bracket
are used to hold frame tubes together in lugged external bearing bottom bracket
frames  which also form the shell that contains the spindle and bearings; the term is now used for all frames, bracketed or not.