I think a lot depends on the wheel. Some 17's look smaller than others. It also depends what car they are on. I think wheels look bigger on coupes and LX's because of the lack of side skirts. I used to be very adamant about nothing bigger than 17's on a fox, but after seeing some 18" wheels of specific brands, I think 18's can look great with the correct profile tires. I'm not into the rubber band look either.