P235-70R-15 fitment
235/70/15 on a Duster? Uh, I don't think so. With the backspace on most 15" rims you'd be lucky to fit a 235/60/15. That's been done, but not all cars can pull it off.
I ran 225/60/15's on my duster on cop rims, 15x7 with a 4.25" backspace. I had to max out the lower fender to bumper brace to clear the front corner when turning, and those are only 25.7" tall tires. Here's a picture with the 225/60/15's. I don't see an extra 2.3" for tire diameter.