Originally Posted by 03SG///M3
If i go with the 9.5 front and 10 rear will i need spacers?
If you run a 265/35/18 front street tire on the 9.5" wheels then you will not need any spacers at all. I would recommend a spacer for an r-compound or racing slick in that specific size. The rear 18x10" is spec'ed as the correct offset for the E92 M3 for the street and race tires.
A common tire for example would be the Nitto NT-05 in 265/35/18 front and 285/35/18 rear.