PressFit-30 (PF30) bottom brackets are a separate component pressed directly into the frame. The PF30 bottom bracket shell is typically 68mm (road) or 73mm (mtb) wide with an inside diameter of 46mm. The bearings are pressed into cups and the cups then pressed into the frame. Originally designed for 30mm spindle cranks, there are many available bottom brackets for 29mm SRAM DUB cranks, 24mm (Shimano, FSA, etc.) cranks or 22/24mm (GXP, SRAM, etc.) cranks.