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I know already about all the benefits of lower unsprung weight, but that would apply for both street and track, you never have too little unsprung weight. Is there that much weight difference between a 19" and an 18" wheel? (I wouldn't have thought so). If so, wouldn't you want to run 17" or even 16" for the track then? Or wouldn't you have the same effect by getting lighter 19" wheels?
Part of what I'm trying to figure out here is why does BMW M go to 19" wheels for the 1M or the M3 competition package? Looks only? I thought "M treatment" was more about go than show...
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