Quote:
Originally Posted by RPM90
Unless we know the actual ratio of the 19's we don't know if they will be taller. Do you know for sure that the overall diameter will be increased?
I don't mean the diameter of the 19's wheel that will be used, as we know that is larger, but, do you know what the profile will be, for sure?
People go on about lighter weight in wheel/tire because it does make a difference. Stock for stock a 19 is a good bit heavier than an 18, and when you include the tires the difference is even greater.
If BMW goes with a lighter wheel compound, they could easily have used the same compound for a lighter 18.
The 19" choice is probably more cosmetic, as it doesn't help reduce unsprung weight.
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BMW doesn't use run flat on their M cars, so it is likely they are running a lighter wheel then our 135 or similar cars. so it won't matter if they are using the 18 or 19 on the car, because either way, it's likely going to be lighter then what we are currently "blessed" with.