Quote:
Originally Posted by Aufwuchs
I bought a CPO 2015 M235i last week. Just noticed that the new tires installed by the dealer are 225/45 rather than the specified 225/40. They are the Pirelli run flats. Any reason to be concerned or raise the issue with the dealership? I absolutely love the car so far. Thanks!
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The overall diameter of the 45's will be slightly taller than the 40's.
225/40 = 25.09"
225/45 = 25.97"
So there is a 0.89" difference in height equaling 3.5% unless the dealer recalibrated your speedo which I doubt. If you're driving 60mph, your actual speed with the taller tire will be 62.12mph. No concern really.