Originally Posted by David@ApexRaceParts
The 10" wheel will give a little better sidewall support for the 275/40/17 in comparison to the 9.5" wheel, which can be beneficial on road courses. The 275/40/17 on the 17x9.5" ET35 is definitely the easier fit which is why it's so well known, as it doesn't require much work for the wheel to fit on the e9x.
Can you quantify the "little better" in this statement? Is it significant, as in can be felt? Is it significant enough that I'd take the weight penalty of running an 18x10 EC-7 (et33) rather than the 17x10 arc-8 (et25) ?
Thanks for your input