Quote:
Originally Posted by nmulax
Joe,
The 18x10 with 275/35/18 rear vs. 18x9.5 with 265/35/18… is this just about looks from behind, or is there a slight performance edge? Since in your PM you said they share the same concave face.
Also, I'll need extended lug-bolts (or a stud conversion) to handle the new offset correct?
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That is correct, all of our 18" concave ARC-8 wheels share the same wheel face whether you are looking at the most conservative 18x9.5" ET35 or the widest 18x10.5" ET27 wheel.
The 18x10" ET25 with the 275/35/18 in the staggered configuration will provide more rear grip than the 18x9.5" ET35 in the square configuration. The square configured car will have much more balance and feel more neutral as a track set up. The 18x9.5" ET35 in the rear of the Z4M is a conservative fitment but is required when doing the 18x9.5" square set up because any lower of an offset wheel will be much too aggressive of a fitment for the front of the car. Most people will just install a 12mm or larger rear wheel spacer to fill in the fender more for a more flush to the fender and pleasing aesthetic look.
You will need either extended lug bolts or a stud kit when ever using wheel spacers.