Stock diameter is not 27". It's 26.
DSC is "calibrated" to ignore rotational differences of 5% or less. The difference between 25.7" and 25.3" is well within margin. 245/40/18 and 265/35/18 are common tire sizes MANY of us have run with on and off track. "M-track mode" will make zero difference regarding his tire size.
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