PF30 is a pressfit bottom bracket shell measuring 46mm in diameter and either 68mm, 73mm or 83mm in width. Many manufacturer's prefer this over-sized bottom bracket shell option because almost any crank spindle can fit through it but if a smaller bottom bracket shell diameter was used it'll limit the number of crank options that are compatible with the frame.
This interface works well with a 30mm crank spindle diameter since there is 16mm (8mm each side) of clearance for a bearing to fit into. It is certainly possible to use a 24mm crank spindle in a PF30 bottom bracket shell as well with the use of an adapter.
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