hi mate ive got focus rs alloys on my 170 using 225/35/ZR18 conti contact sport
3 and they dont rub/scrub the arches what so ever but if you use the standard
225/40/ZR18s they wont rub but will scrub the arch lips on all 4 corners of the wings as they sit to tall in the arches

or you can use the rs reps like i had before i changed mine