Thanks for the confirmation.On my setup I can get 1 finger in between the tire and the bottom strut plate, but not two fingers. So if you go much larger than the 245/65R17 that I did, it will rub. I wanted to go a little larger on the tire, but I decided that they would not fit. I seriously looked at them, but the 70 series is a full 1 inch larger, figure that if there is a clearance of 1/4" or so, then the added approx 1/2" you will gain at the top will put you in contact with the strut. Perhaps a different offset wheel can gain you a little back by pushing the combo out a bit? The stock wheels are a +49.5 offset and the Mayhem Warrior's that I installed are a +40 offset. All of that said, I think 245/65R17 is about the top you can get under there without more modification. Because the AT3 is such a beefy looking tire to begin with, the tire looks good and meaty under the Santa Fe.
Hope that helps.
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My winter set are 13+ gen coupe 18s so the fronts are already 18x7.5 +32 and rears are 18x8 +30. So even on oem tire sizes it still sits slightly under the strut so I'm betting the offset would need to be at least 20 or lower. I'm not much about that poke look so 245/65R17 would be the max I'd go too 😕