People with 35's have this issue to so tires change is coincidental
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No, not necessarily. 35's are actually bigger than stock BFGs depending on which brand you go to. I think it's fair to say that going to 37's may not be the only reason that the nav unit gets thrown off. But to say that it's simply coincidental at this point is incorrect. We have someone who went to 37's. Had the problem. Then went back to stock and the problem was gone. I had not issue and then switched to 37's and immediately saw the problem. It could be that people with non-stock 35's are having the issue but the nav is not that far off for them to notice because the size is close to the stock tire radius.