That depends on taste aswell. You can run 185/65-15s up the something in the 20" rims. Width and height is really your call. Some guys like 275/60-15s all the way around but I find it Hideous. A member on RCC has 30x9.50s and says they clear on his lowered Rc. I ran 205s to 225s on my clubcab with cut coils and my truck literally road on the bumpstop brackets.