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4th Gen Ram Tech2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I've seen 35x12.50x20 Mickey Thompson ATZ's put on the stock 20s with a 4-1/2" kit before. No spacer was required, but it was close. A 13" wide tire probably wouldn't fit.