I've got a set of rear wheels for my s2000, sized 18x10.5 +57. Trying to get an idea of a good tire size to run on this. The rear fenders are rolled and the bumper tab has been relocated. The car isn't super low, but I don't want it to rub either. Advice is greatly appreciated.v

 

255 35 18 if you're OK with a slight stretch. 265 35 18 if you want something to sit square.

 

I have a 9.5 in wheel with a 255 and it had a light stretch so if I were you I would do 265 and you'll be fine am planning on running a 275 next new tires

 

With the shorter sidewall of the 18, a 285/30 sits square on that width rim if you have ever seen examples of it. Unfortunately your offset is one that is right on the cusp of fitment, so unless your planning on running an overly aggressive amount of camber which I wouldn't recomend, the 265/35 would be the only natural option since its the minimum width you would want to run on that rim width and has an overall diameter that is not too crazy over stock. 275/35 is a pretty tall tire. Could give you fitment issues as a result as well.