Fitting a SRAM DUB 29mm spindle into a "BB92" (41mm ID) shell does not leave much room for the bearings. By making the outer race of these bearings into the "cup" and adding a second row of ball bearings, a very strong and reliable bottom bracket option has been achieved. The 440C stainless steel races and Grade 5 ball bearings are very resistant to corrosion.

Please note that this adapter bottom bracket is designed for use with BB92 bottom bracket shells with a press-fit ID of 41mm in conjunction with a SRAM DUB mountain crankset. THIS WILL ALSO WORK with a BB86 road bottom bracket shell when paired with a SRAM DUB road crankset. The DUB crank spindles may at first glance appear to have 30mm diameters. In fact they, have a 28.99mm proprietary spec. We like to keep things real and call this a nominal 29mm crank spindle OD.