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      10-04-2012, 10:33 PM   #3
slicer
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Drives: '13 E92 M3
Join Date: Jan 2009
Location: San Diego, CA

iTrader: (20)

8.5" is a width not a diameter.

245/40/18 fits the M3. It's the stock size in the front (on 18 x 8.5" wheels).

The ZCP brakes are no different than the NON-ZCP cars. 18" wheels are available OEM and fit the M3 if they are the correct offset / width.
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'13 M3 - Silverstone II - CAR FOR SALE - (CLICK LINK)
PARTS FOR SALE - (CLICK LINKS) KW Clubsport 3-way, Planted E92 Floor Mounts