Quote:
Originally Posted by wnta1ss
Yes the autos shift on mph. Think that the computer uses the speedometer, but the car also has speed sensors on all 4 wheels for stabilitrack/abs. I only tried the 28" DRs when the trans was locked, so I don't know for sure what a 26" would do to it. Will mention that putting 26" tires on back makes stabilitrack get mad. Based on my past experience with the locked trans, I think that it might be a good idea to get stock diameter, or as close as possible, for a 2020. Not a very common diameter in DRs, but Nitto does make the 555R2 in 275/35-20, which was the stock rear size on my SS for example. Of course, only testing and logging would tell what the sizes actually do to the shifting.
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I was thinking of a 26.7 to a 27.0 inch tall tire. The OE diameter is 27.6 to 27.7, I do not think those diameters would bother anything and give me a little gear advantage . The 2.77 rear would be nice if it was a 2.85 ratio.