My concern is the 2017 saloon has different ET to the Sportback and ET 38 seems a fair bit different to the ET 46 states for the front wheels. I have no idea why the Saloon would be different but when I phoned a wheel supplier they had all RS3s shown as the same size, but Audi stated they are not when I phoned them.
I will do some comparison on the will they fit later as a starting point. The ETs of 42 and 46 are quite high compared to most wheels being shown up as around 25 to 40, so it would be good if someone knows why the Saloon is different.
Here is my understanding, your car (and mine) will have the bog std wheel which is 19" 8.0J 235/35 rubber and ET 42 back and front. Car can be supplied with 19" 8.5J 255/30 rubber and ET 46. But as well as costing more the road fund licence is also considerably more expensive and, as I don't like the wheels anyway, I decided on std rims which will be changed. Looking at the Hartmann pictures of an RS 3 the rims I mentioned do look well. And, on reaching out to them, they say they are a perfect fit in every way.
2018 > Catalunya Red saloon < Black pack ~ pano sunroof ~ privacy glass ~ LD Prestige gloss black wheel rims ~ red brake calipers ~ matrix LED ~ Gtechnic Ultra ~ Suntec PPF to complete front incl mirror caps ~ folding mirrors ~ keyless entry ~ sports exhaust ~ black badged ~ supersports seats ~ Blackvue DR 900s 2CH dash cam with OBD-II power source ~ RS design pack ~ comfort pack<