I am currently in a 2019 S4, but I ordered a 2019 RS3 last weekend. I was able to source a set of 20" Rotors off of an A6, and installed 255/30/20 Hankook Ventus V12 Evo2 tires on them. I was initially thinking I'd have to just sell this set of wheels, as I had little intention of running a +1 wheel size on an RS3.

BUTTT, I find the stock wheels atrocious. So, if I could run these for a little bit while I pick out a set of lighter 19s, and I don't have to look at the stock wheels, so it's kind of a temporary win for me.

These are 20x8.5, et 45, with a 10mm spacer. From all the searching I've done, it seems like the offset is about perfect if I add the spacers. Everyone on this forum seems to be doing 245/30/20. However, the TTRS is spec'd with 255/30/20, and that seems to be fine. A ton of people are running 255/35/19 tires, which are the exact same rolling circumference as my setup. Does anyone here have any specific experience they could share??

Thanks.