You could potentially fit a 20" wide wheel under your fender if you wanted, its all about the offset and fender work. You're rubbing on the inside or the outside?
Any size over 8 inches with a negative offset is going to require at least rolled fenders, with offsets that neg. You'll need flares. Either way -70 is going to look mexi, no matter what you do. Why not get a wider rim, with an offset closer to zero?
lmaooo i got eagle hammerheads but yeah im rubbing on the outside but im going to get rid of the rims, not going to spend the money to do a widebody or fender flares on 4 lug rims