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@snottyotter
Check the sheldon link above for how to measure, the whole point of the BB axle length is to match your cranks to the correct chainline, as long as you get the right thread and shell width then the BB can't be too big for the frame, although the cranks could end up far too close or far away from it. The frame you've got is pretty unimportant unless there is an issue with chainstay clearances or something.