The sram bb30 bearing assembly kit contains all parts to help you install a truvativ or sram bb30 crankset into your compatible bb30 ready frameset this kit makes it easy for you to replace your creaking or failing bb30 bearing by essentially press bearings directly into an oversized bb shell unlike integrated headsets this kit actually has performance upsides by offering you a substantially lighter and stiffer bottom bracket sram bb30 bearing assembly kit features contains 2 x bearings