i think its more the strut plate area.. but if u have like rs500 splitter there sometimes run that aswell.. my friend has konis on his and he used to run 215 on front and 225 on rear with no issues but i think his arches are cut away.. my car hasnt had nothing done to arch lip and bodykit is uncut so i didnt risk out lol.. i think but there arnt cheap you can get a 215/35/17