I think as long as you try and retain a decent size sidewall, it can be pulled off very well. However, when people start going to 22-24" wheels, then it gets to be a bit stupid.

I think (like stated above) 18's with 35" tires look good even 20's with 35" tires but 37's with 20's look better. It's not like I am even going to consider an aggressive tires, may a MT...maybe. I do like Baja Claws.