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Note that those calculated sizes are "notional"--they generally reflect the actual sizes of the tires, but are not necessarily completely accurate. Usually the tire makers will give a "revs/mile" figure, to tell you how many revolutions the tire will make in one mile. Fewer revs means a taller tire, more revs means a shorter tire.
Tirerack shows the revs/mile figures for many of their tires, and those can be used as a basis for comparison.
Of course, inflation pressures, wear, and even rim width can also make some difference in that figure so even those numbers may not be absolutely precise.
-soD
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