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What exactly are you trying to figure out? By looking at the second set of calculations it shows a sidewall of .9" radius of 8.4" and diameter of 16.8". Even the smallest low profile lowrider tire is bigger than that.
What number is this supposed to be? Should 31/75-15 be 315/75-15? If so you are comparing the following:
235/75-15 is 28.9 inches in diam
315/75-15 is 33.6 inches in diam
33.6/28.9 = 1.16
If your speedo is geared for the 235 tires and you put on the 315 tires you will have gone 116 miles for every 100 miles your odometer shows. You will also be going 16% faster than the speedo shows.
the wierd thing is, is that when i am going 52 mph im actually going 40. I have 31in tires with 4.56 gearing. so with that said what would be the difference every 200 miles on a non calibrated odometer