Stainless steel bottom bracket shell - ISO threaded - 69mm
sku # BBSUS-ISO-69 Made from 17-4 stainless steel bar stock, these 38.1mm (outer diameter) ISO bicycle bottom bracket shells are 69mm wide. These BB shells are made with an extra 1mm of width ensuring sufficient material for facing both sides. At the end of the facing process, they will then be 68mm. Drive side can be identified by the slight gap/recess on the drive side before the threads begin. These BB shells are recessed on the inside to make them compatible with Paragon's heat-sinks. ISO aka BSA, BSC, BC, British, and Euro. Right and left threaded (ISO) 1.370" x 24tpi. 69mm - 99g Weights are based on representative samples. Actual weights may vary slightly. Imported.