Bottom bracket standards seem to be a dime a dozen these days, so to stay on top of the game, SRAM stays current to reflect the sizes used in the industry with the GXP BB92 Bottom Bracket. The BB92 uses two sets of steel bearings in nylon cups that "press" into each side of the bottom bracket shell. We can use any SRAM 24mm crankset from here in your "non-standard" bottom bracket shell.