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      02-18-2013, 07:30 AM   #72
Iron Man

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Drives: '13 128i Alpinweiß/Korallenrot
Join Date: Mar 2010
Location: NC

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Originally Posted by loesch View Post
More rubber in contact with the road = more traction. Less rotational mass = faster acceleration. +1 death to run flats. Why bother when I can press the SOS button on the roof and get a free fix-a-flat.
Less rotational mass? A wider tire, of the same diameter, would weigh more and have greater mass. Tire weights vary by manufacturer/model a few pounds, most likely when you go with a wider tire, you will have a heavier tire (of course RFT vs non-RFT will make a difference in weight, if that is what you meant by less mass?).