This may be a little off topic, but it pertains to tow vehicles and boat trailers. And, this may be really stupid, but...When you change wheel sizes it seems that everyone likewise changes the profile of the tires they use. For example, when putting on 20" wheels from 17" or 18", it looks like you go to lower profile tires. Is that done in order to keep the tire diameter the same? If you didn't do that, I would expect that the tire diameter would be larger than original equipment and either you would have to figure out a way to recalibrate your speedo and odometer or have inaccurate readings on both. Can anyone explain the whole process. I am thinkin about getting larger wheels on my 2006 Jeep Grand Cherokee Limited Hemi but haven't done any research on it yet. Thanks.
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