Bottom bracket standards seem to be a dime a dozen these days. To stay on top of the game, SRAM stays current in order to reflect the sizes being used in the industry. This is its 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. From here, you're able to use any SRAM 24mm crankset in your "non-standard" bottom bracket shell.