I have a 2008 gs 350...I have 20" rims and the tires I have on there is too small being that i live in ny and the roads are trash. I'm wondering would a 235/35/20 FIT without rubbing?

 

That depends on what offset, how low you are, and how wide of a rim you're talking about. Also what tire size are you running right now? 235/35/20 is a good tire size for my 8.5 +3X offset, meatier than 245/30/20.