Max tire size

I just bought a 2000 Rodeo and am wondering what the MAX tire diameter you can fit on it without rubbing? As soon as i know the max size i can decide on a 18" or a 20". I want to run a larger rim but want a meaner looking all terrain tire.

Also, what size tires if i have the 3" lift on it?

http://www.pureisuzu.com/tire_chart.htm

http://independent4x.com/
or try posting the ? here http://www.4x4wire.com/forums/postlist.php?Cat=&Board=UBB68
i think the largest you can get with a 3" bl and3" suspenion would be 33"tires

I have a 98 running 235 75 15. they only rub when i have my wheel cranked to the end.