Sram bb30 bb assembly kit alloy bearingssram bb30 assembly kit bb30 what is it its what the bike industry did to the headtube when they introduced integrated headsets theyre about to do again to bottom brackets by creating a new standard the bb30 is where you essentially press bearings directly into an oversized bb shell it eliminates the need for external or internal bb cups unlike integrated headsets the bb30 actually has performance upsides you get a substantially lighter and st