I just bought new wheels for my 2014 jeep wrangler and it has these specifications;
Size 17x9
Offset -12 mm
Center bore 78 mm
Im considering to go with 285/70r17.. so I was wondering will it rub? and do i need spacers if it’s rubbing? Or shall I go with 265/70r17 tires and have no issues.

 

You should be fine with that wheel tire combo. At extreme articulation with the sway bar disconnect you might rub the fenders a bit but on all other driving you should be fine. If anything you simple add 1" of bump stop to your set up.