The fsa bb30 road ceramic bottom bracket is 2 bearings that are directly pressed into the frame and seated against a cir clips that are installed into machined grooves in the bottom bracket shell to have a bb30 compatible shell on your frame the inner diameter needs to measure 42mm and have no threads on the inside the ceramic bearings will give you a 4 increase in speed over standard bearings so if your looking to upgrade your current bb30 this is what to go for it comes with wave spring