2008 Grand Caravan
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A 70 series is generally narrower section width than a 65 when both tires are 225, so all other measurements would not be identical. The tread should be narrower. The 65 series is used to improve handling over 70 series. Premium name brand tires like Firestone's in the correct size are sold at tirerack for under $90 each. The total cost for a set of 4 comes to $360 plus $50 for mounting plus $50 shipping = $460. I'm guessing you're trying to buy tires locally at a place that only stocks a few sizes, so you're likely gonna pay more for the wrong tire size and they will likely wear out faster and handle poorly.
PS: I plan to run 215/70-16's in the winter to reduce width and increase traction. They are closer to the correct height.
Last edited by Lscman; 03-31-2013 at 03:06 PM.