Which tires are you running and what additional mods to you have? Lift, trimming, etc. I was under the impression 70 was the tallest tire ratio thay could fit it without impacting.
While I could have gone a little bit larger, I wanted to still keep the spare out of sight in the cargo bin. Similar to what others have stated on other threads, the largest size you can go and still use the cargo tub is 245/75/17. Mine just barely squeeze in. I have BF Goodrich K02's. That tire has been magnifico!! in all the off road trails I have hit, including many Badge of Honor Trails....
No rubbing at all with the 245/75/17 size.
2015 Cherokee Trailhawk:
Granite Crystal, 3.2L V6, 8.4 Nav, black leather, sunroof, tow, tech, comfort/conv, no hood decal, 9 speakers, CD player, Maximum Care lifetime warranty, Mopar first aid kit, rear rubber cargo mat, Thule Aeroblade cross bars (black), Thule Rapid Aero feet, Kuat Vagabond X cargo basket, RRO rock rails with smooth covers, Mopar door sills, Raingler ceiling net, Raingler seat headrest handles, MFC aluminum lift kit, RRO winch bar and Warn M8000S winch, BFG T/A KO2s