I'd say the most common aftermarket tire is the 275/60/15 which is about 28" just like the 235/70 so it will fit. The real questions is why so skinny in the tread/section width if the 275 will fit no problem?
Though I have it mounted on a 10" wide rim with a 4.5 B.S., what matters is that 4.9" is going inward towards the frame from the mounting point. That means a 15x8 with the 275 would need a B.S. of 3.5" to match that without rubbing.