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      11-07-2007, 05:51 PM   #23
Coyot
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Join Date: Aug 2006
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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.