Measuring my frame

give us some clues what type of frame did you buy ? if it is a track frame then 120mm is more than likely the rear spacing most track hubs will fit 120mm if it is a geared i guess it could be 126mm 130mm spacing if it's a steel frame you should be able to squeeze the frame a bit to close the gap steel can be squished a bit without causing damage alloy / carbon i wouldn't

Thanks for the replies Everyone.

It is a steel Simoncini track frame