sierrax
+1y
Here's a 245/35/20 on a 8.5" wheel to give you the general idea. They suck for ride quality. When running this size tire I recommend a good brand of wheel to help with bending issues. I've seen guys who run wheels like eagle alloys and have bent like 3 wheels, which in the end they've spent more than if they had have just bought a good set.
A 245/30/20 is 25.79" high and a 245/35/20 has an overall diameter of 26.75".