@Graham_Edin the drop on the tfg ono isn't that drastic. It shouldn't affect the effective top tube length that badly.
570mm has a 53cm effective top tube, if @Graham_Edin standard geo bike has a 57tt he'll need at least the 590mm, or even the 620mm, with a 575mm effective tt.
@Breso started
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@Graham_Edin the drop on the tfg ono isn't that drastic. It shouldn't affect the effective top tube length that badly.