e. 13 BSA 83mm Threaded Bottom Bracket The e. 13 BSA 83mm Threaded Bottom Bracket adapts 30mm spindle e*thirteen cranks to standard BSA threaded BB shells. It also features custom bearings designed for high performance, long lasting durability and smooth as butter spinning. Features Material: EXA+ Aluminum Compatibility: XCX, TRS, LG1 Bearings: Custom 6806 radial bearings BB Shell: 83 Color: Black Weight: 94g | E. thirteen | Bsa 83Mm Threaded Bb 83Mm Threaded Bottom Bracket