Sealed Bearing Extractor Set for Bottom Brackets Essential KitThese extractors remove sealed bearings with inside diameters from 22, 24, 29, and 30mm Bearing extractors grip the inside race of a sealed bearing, allowing the bearing to be tapped out of the hub shell or frame component. Insert the extractor into the bearing, tighten one side with a matching wrench, and the collet expands to grip the inside of the bearing. Tap the extractor & bearing out together with a punch and hammer. All extractors are size