The fsa pf30 road ceramic bottom bracket is a variant of the bb30 design that uses bb30 bearings that are preinstalled in a bearing cups the bearing cups out diameter is 46mm so to fit your frame the bb shell inner diameter must measure 46mm too the ceramic bearings will give you a 4 increase in speed over standard bearings so if your looking to upgrade your current pf30 this is what to go for comes ready with wave springs cir clips and nylon adjustment washers because pf30 uses bb30 bea