Looking at a set of RS5 wheels that are 9J by 19, ET33 with 235/35/19 tyres. From memory the standard S3 wheels are 8J by 18, ET50 with 225/40/19 tyres.
Used an online comparison tool and it came up with this:
So think they'll be OK size wise, only other thing is that they'll have a centre bore of 66.6 which means ill need spigot rings.
Anyone had any experience of running these? Assume just like a spacer - held in by doing the wheel nuts up tight!