I am getting a new set of rotas 17x8,5 et30
what tires should i use and any other advise about fitment is welcome..

 

the offset is rather low for the s2k. if you want to fit those wheels, plan on rolling and pulling your fenders, relocating your rear tab, running a good amount of negative camber and possibly stretching your tires

 

Won't need stretched tires. I'd go 245's all the way around at first. You will need a roll and pull and some camber. The fronts will give you more problems that the rear.

 

I would say run 245/40 and have some negative camber not too much. Maybe -2 would be ideal. Of course the fender mods like previous suggestion.