The FSA BB30 Road Bottom Bracket is 2 bearings that are directly pressed into the frame & 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 & have no threads on the inside. This is a replacement for the standard FSA BB30 cartridge bearings that make up the bottom bracket. It comes with Wave spring, bearing covers, cir-clips & nylon adjustment washers. They will work with FSA BB30 Gossamer & Energy BB30 cranks.