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The problem with using the wheel is that direct inches or millimeters of measured toe are not the same as the industry-standard which alignment specs are given in. You have to scale based on tire OD/wheel OD to get the conventional toe dimension.
0.125 inches of toe measured at the wheel on a 17" wheel with 25" tire = (25/17)*0.125" = 0.22 inches of toe in the standard measurement.
Again, it's a big difference and if you don't account for it you'll end up giving yourself way more toe than desired or intended...
Probably best to just convert directly to degrees which I prefer for units anyway, to remove ambiguity.
0.125" at 17" wheel = (.125/17)*180/pi = 0.42° (calculation for reference only, way too much for any usage IMO)
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