No, what your brother put into the PCM should not have any effect if you correct it using the Gryphon.
So OK, now you have much smaller tires on all axles. I see them as having an unloaded diameter of about 30.5 inches. With no squish, the circumference is 2434mm. With a 7% rubber squish (what I'd start with), the value you should enter for Tire Size is 2364mm.
Remember to hit <Enter> after you do that, then scroll to "Done" and hit <Enter> again to start programming.
- Jack
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