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The speedo usually over-reads mph by a few
with stock 205/45/r17, so the 215/45/r17
will actually get you closer to the true speed
on the speedometer.
I chose 215/45r17 mainly because the tires
I wanted (M. Pilot Sport 4S) are made in 215
but not 205, though.
215/40r18 Continental Exteme contact sort on 18inch oem wheels. Looking forward to see how it handles different compared to my run flats I had on previously.