With no weight on the tires, they would have a diameter of 31.6" (802 mm) and a circumference of 2521mm. Normally, squish reduces any of those figures by about 3% (multiply by 0.97).
So, I'd start with a diameter of 30.7" or a circumference of 2445mm.
- Jack
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2014 F150 Platinum SCrew 3.5L EcoBoost 4x4 with SCT programmer
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