RT4WD wheel question

I have a set and they have a pair of junk tires on them. I am looking to get some stretch, but Im not sure what size tire to get and im not sure on the width of a rt4wd wheel. I dont want a super low pro, I want a little it on sidewall as well. Any ideas helps, thanks.
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Then you need to search a little harder because there is even a topic about this very subject.