Re: Wheel and tire confusion
Tire outside diameter is calculated as follows:
285 = tire width in millimeters.
70 = tire sidewall percentage of width
17 = wheel diameter in inches
Tire O.D. is then:
285 mm / 25.4 mm/inch = 11.22 inches (the tire width)
11.22 inches x 0.70 = 7.85 inches (the tire sidewall)
Tire O.D. = (7.85 inches x 2) + 17 inches = 32.7 inches
Likewise, 295/70/R17 = 33.25 inches
The 9" wheel width shouldn't affect overall diameter.
If your end goal is 33", it looks like you need to decide whether you want just over 33" or just under 33" with these options. I have 305/70/R16 (~32.8") and I rub a lot at full lock, even without suspension activity. Of course there are many other factors, but this might be a case for going slightly smaller.
(corrected my tire size)
2002 E350 EB - Voyager top - 7.3 - Quigley 4WD