BB30 ADAPTER - BB30-SHIM adapts 24mm Spindle Cranks (Shimano, FSA, etc.) to work on BB30 frames. - The BB30-SRAM adapts 22/24mm Spindle Cranks (SRAM/TruVativ) to work on BB30 frames. - Simply tap the adapters into the 6806 bearing in the BB shell, install the spindle and cranks. - Use Crank Spindle Spacers to adjust your chainline, or take up any side-to-side movement in your cranks. - 68mm only