Originally Posted by Coyot
Even if fine, forged 19s have the very same mass with "normal" 18s, this mass is spread around a circle of bigger radius than than the one of the 18s, causing more rotational inertia and thus impeding [more than 18s] acceleration and deceleration.
When it comes to brakes, 18s can house brake discs up to 360mm diameter (14 inches +). Really fine, sophisticated brakes of that diameter are capable of stopping anything, forever.
The question is why BMW had to make these M3-specific 18s so ugly.
I agree that tje 18's are fugly. In the e46 M3 did BMW change the wheel design at some point or were the same wheels offered throughout the the entire model life