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      10-23-2012, 07:54 PM   #7
rzm3
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Drives: E92 M3
Join Date: Aug 2007
Location: USA

iTrader: (14)

I use a 18x10 et25 set up all around. With 3+ camber up front and 2+ in the rear.

Due to the amount of camber, I can easily use 10 mm spacers front and rear on 275/35/18 Continental scrubs. However, it is pretty tight in the rear (tire to fender) with spacers. There's plenty of room if you don't use spacers in the back.

Front space I cannot say since I have aftermarket struts.

One consideration is that there are not too many tires available in 285/35/18. 285/30/18 offers more but you would lose your side wall.

Another consideration is the balance. The M3 understeers from the factory, so depending on your set up you may prefer a square over a staggered.
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2011 E92 M3 DCT
1991 Spec Miata
2008 E92 M3 DCT
2008 E92 M3 6MT
2008 E92 335xi