Originally Posted by kevkaz
I hope this isn't a dumb question but I can't seem to find a good answer. My car came with 18s, 245/40 and 265/40. Going to a square setup with 275/35 is going to make the rear wheels 3% smaller, can this cause speedo and traction control issues?
You will have zero problems. Countless people are already running this setup, and have been doing the same with numerous other BMW models. If there were an issue people would be talking about it.