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Originally Posted by doubleurx
I was using the handy Miata calculator that shows the 225/45/17 and the 255/40/17 with exactly the same diameter of 25.0. Why I considered the alternate size is because the car originally came with 205/55/16 fronts and 225/50/16 rears that also have the exact same diameter of 24.9. Why Porsche recommends an upsize that doesn't exactly match, I have no idea?
I've posted this on some porsche forums with one response from someone that has the upsized tire with no issues and they agreed with me with regards to the diameter.
The neova's are also on sale, but much more pricey than the azenis.
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The 225s will probably be fine. I think the 615s and Neovas are just a bit much for a dialy/weekend driver street car.