Quote:
Originally Posted by skierman64
They aren't cheaper in quality, they are the exact same tire just a different size. The 18" are less expensive. And BMW says the car handles better with the 18s than the 19s. I'm not sure how that is quantified, but perhaps the 18s turn better lap times than the 19s.
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One thing is for certain, the 18" make the ride quality measurably better.