Here is a interesting Tire size comparison list from Neal Wood’s (Cult’s product designer). This list shows the true widths and inflated sizes of the largest Tires out right now. So if you ever wondered how big your tires actually are then this is worth a look at.
Also remember tire widths generally have a manufacturing tolerance of +/- 2mm for the inflation diameter. Measurements can vary up or down depending on the production batch, rim being used as well as many other variables.