The original wheel setup on my 2015 JKU Sport S was 17x7.5 with a 255/75r17 tire. That being said, a 265/70r17 should not rub at all, even at full flex. I would recommend less backspacing but that's your choice. My tires are 295/70r17 and rims have 4.75" of backspacing and they lightly rub at full flex (I installed a 2" leveling kit) and full turn.
'15 JKU/ 3" Synergy MFG Stage 2/ Fox 2.0 Performance Series IFP/ 35" KM2/ 4.56 Yukon Gears/ Currie Rock Jock 44/ ARB Locker/ Adams 1310/ VKS Fab/ Evo MFG