I realize that this is a bit late, but someone else could benefit from it.
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I am not concerned about the speedometer since the actual speed is slightly lower than what is showing up on the speedometer
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So what you are saying is that it is already inflating your speed AND odometer miles! Going to a shorter tire will only make it worse. And this relationship is linear, going from 27.5” tire to a 27.0 will inflate your miles by 3.6%. Over an average lifespan of a minivan tire (60k miles) it would be 2200 miles, which is not a huge deal unless you are 2k miles over the warranty and need to have a major repair performed
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The 235/60's are much wider which makes life in the snow a bit more difficult.
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Well, it is just as much wider than 225s, than 215s are narrower
(I am not sure if that made sense
). If width if your concern, check into the actual TREAD width specification, you will find not all 225 tires are the same. Different manufacturers have different ideas of what that actually means, so you might be to find a 235 tire which is close to 225 made by GY. I have even seen a significant variations between different models with-in the same brand!
Personally, I do not consider that a major difference in width. And a particular tread design will be a bigger contributor to snow weather handling than “10mm” on the rated width!
What did you end up going with?