What's the biggest rim size possible without rubbing arches in standard suspension??

AJ-S3

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Hi all. At the moment i have standard 17 inch BBS audi rims on my 2005 sportback. However, i want to change these alloys to the rs6s-line wheels. Whats the biggest rim size i can go without rubbing the arches with the standard suspension??
 
on standard you will get a set of these on if you wanted lol ...only kidding

you will get a set of rs6 in 18 or 19 inch on but it will look a little high it would look much better if you lower it on springs with 19inch rs6s

80711699.jpg
 
I've seen 20"s in here ( in forum pictures ) with lowered car.
More got to do with wheel width and off than diameter.

Maybe 22" is enough low prifile rubber, narror wheel and good offset.
 
for the same rolling radius approx you have a choice of:

225/45/17
225 or 235/40/18
225 or 235/35/19
225 or 235/30/20

all on an 8x wheel with an offset of approx 45-50 would fit but:
19" wheels look great but do make the ride/handling worse
20" would be a terrible ride and a ps2 in 235/30/20 cost about £350 each