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I hadn't considered that so many variables came into play. Definitely hard to isolate only the aero penalty, then cross reference with rolling resistance...
I am looking for a tire diameter of 27.2" ideally. Plus a point or 2 would be OK.
My tire guy tells me that 16" and 18" tires are more common than 17", so I was mainly looking at those sizes.
That said, I don't think it's that big of a deal. 215-60r17 gives me the exact diameter to make my speedometer correct. 205-70r16 is close, but the cornering is already pretty squishy. Those 70 profile sidewalls would add to that.
Not planning on lowering the car, but maybe if it ever needs struts.
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