I agree. IMO the ride quality is very different. I had two sets of summer 225/40/18 and was ready to "downgrade" to 17", fed up with the ride quality (my winter 17" were riding just fine). I decided to try 225/45/18 and now my ride quality is just fine. In my case, I know that I have a speed error of 3.4% but that's not a big deal to me.
Originally Posted by Yobyot
This would be a BIG mistake.
2007 E90 AW 323i Step | Lowered 1.25"/1" | BMW Performance Exhaust | Debadged | Scangauge II | Style 162 18" & 161 17" wheels & rear 15mm spacers