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Re: unsprung weight, I saved over 20 lbs when I replaced those same 17" OE wheels and RFTs with 19" and Michelin SS Pilots. Surprised me to go up 2" and save weight. Go online to tirerack.com and "view" similar wheels in 20" on your car color. Good luck!
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Sold 2011 Z4, kept 2002 M3
PM for various e89 parts 4sale.
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