Fsa bb pf30 mtb bottom bracket pf7000pf30 bottom bracket standard is a variant of the bb30 design the pf30 uses bb30 bearings preinstalled in bearing cups the bearing cup outer diameter od and the frames bb shell inner diameter id measure 46mm because pf30 uses a bb30 bearing the pf30 system is compatible with bb30 mtb cranksets features material cr mo steel bb30 cartridge bearing bb shell width 6873mm for mtb compatibility for all fsa and gravity bb30 mountain cranksets includes