I went with 9" (18mm offset) wheels to fit 275/40R20 and have had no issues with the tires rubbing the steering knuckle. I went with 10" wheels mounted with 305/35R20 Nitto NT555 G2's (also with 18mm offset) to avoid having to use spacers. The visual difference between 305's and 315's is nil. See www.tyresizecalculator.com/tyre-wheel-calculators/wheel-rim-size-calculator.
To see my setup, go to 90 Days of Mods! and scroll about halfway down.
To see my setup, go to 90 Days of Mods! and scroll about halfway down.