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Guys, yes tire diameters different front and rear will cause this issue. however, OP indicated 225/40R18 front (25.1" dia) and 255/35R18 rear (25" dia). This should not be an issue, the computer is not going to pick up .1" difference. The answer lies in the heart of the stability system itself. When you align one of these modern vehicles, they have a steering wheel position sensor. If you change toe more than just a nudge, the sensor has to be re-learned to center. If not, you will get these issues. I run a shop specializing in alignments and this has been an issue for us. I'm not sure the procedure for the twins, but I am going to check my alignment machine and let you know.
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