I just go by the standard wheel width and tire size chart. A 10" wide wheel fits a 285: Tire Width for a Wheel/Rim Size ChartHey, I’m planning on getting:
Fast FC04 Titanium
20x8.5 +35 and 20x9.5 +35
Michelin PS AS3+ 245/35/20 and 285/30/20
Would 285s not fit on a 9.5” wheel?