Go to the tire manufacturer's website and look up the specs on the tires you have now and compare the overall diameter to the specs of the tires you are getting. Even if two different brands are the same size, the actual size may differ a lot. I have seen some 33" tires that were closer to 32" and others that were closer to 34". Once you have the exact specs you can find an online speedometer correction calculator. I think interco has one on their site.
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