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Message: <blockquote data-quote="6UE5t" data-source="post: 1064712683" data-attributes="member: 103722">225/45 or 255/40 have about 10.1-10.2cm sidewall height. 235/40 has only 9.4cm sidewall so there's a drop about 0.7-0.8cm. Yes the car will be lowered but the fender gaps also will increase by the same, making it look uglier IMHO coz noticeably bigger fender gaps yet thinner tires.Good article, but then in practice not as easy to do coz you need to find out the exact tread width of the tire candidates that you want for some different sizes too. He's also referring so much to Tirerack.com data which in the US and might not have the same tire models that we have here, or is all Tirerack data correct too? Now based on Tirerack.com data though, my F1A2 size 245/40/18 only has tread width of 7"??? If like that even my 8jj rims is already too wide, not to mention 8.5jj as you suggested! :lol: If it's a typo which I suspect should be 8" then my 8jj rims is also still ideal too. Maybe that's why my fitment still looks fine.And then there's this exception though that he mentioned:" it’s possible that running a tire a lot wider than the wheel width would improve the overall performance if it were on a heavy car, with a less than ideal alignment that is very heavy for the wheel width. In this case, the increased VOLUME/TTSA of the tire, and tread width, would in fact improve the cornering ability of the car.""... increasing the TTSA will make the tires last even longer, and even allow for a tire choice that is less of a compromise for daily driving. "So the question is when can you use tires wider than the rims? How heavy your car needs to be for this case? For normal guys like us who just drive normally on the street (with occasional speeding that is!) that becomes too complicated I think. His tip about selecting tires size first then rims to match the tires is easier to apply though.</blockquote>