Saying that my 285/70/17 Goodyear mt/R 285/70/17 are actually a 1/2" taller then my 33X12.5X15. The 33's don't even come close to 12.5" either. More like 12.2". So other then the 33's being a 1" wider it turns out to be smaller in diameter to the 285's I had.
Of course each manufacture seems to play with sizes too much. Non e seem to meet their claimed size
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like others stated the 285's are about 1" narrower. I like the wider tire look on my JKU but it's your preference! Here is a pic to give you an idea on what a 33x12.50R17 tire on a 4.5" BS rim looks like.
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Most chats for 285/70 17 have a 8.5 wide rim as ideal. approve 7.5 to 9 inch rim.
The 33 12.5 17 have a 10 wide rim as ideal. approve 8.5 to 11 inch rim.
I don't know how important that is. I would make sure I have rims that are at least in the approve range. I have 8" rims so would go with the 285's. I believe the 295's 70 17 call for the same rim. This would be a little wider and taller also.
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