BBB BottomAdapt 386/392Evo To 24mm Shimano Reducer 30-24mm Gold BBO-17 BBB BottomAdapt 386/392Evo To 24mm Shimano Reducer 30-24mm Gold BBO-17. 386/392Evo 24mm reducer. Allows the installation of 24mm Shimano axle crank sets into a 386/392Evo bottom bracket shell (PF30 BB required, not included).
