A 30x10.50 is probably the biggest you'll want to go. Surfscape would know better, but I think you can shove a 31" tire in there if your wheels have the right offset. The rubbing occurs on the inside edge of the tire while turning, so having narrower tires or a wheel that sticks out will allow you to go slightly taller. However, we can't change our gearset, so the higher you go, the more the Escape will drive like a bus.