When I bought my RS5 in March, I took the 265/35/19 snow tires from the M3 I traded in and threw them on some cheap 19" wheels to get me through the last few weeks of winter.
Overall, I wouldn't say the ride quality changed much, even with the slightly taller tire. However, if you're going to go with 19's I recommend using a 275/35/19 tire. It will be closer to the OEM wheel/tire diameter and will give you a taller sidewall for some extra ride cushion.
This year I'm transitioning my OEM 20's over to winter duty with some 275/30/20 snow tires. Personally, I think 20" wheels suit this car much better and considering that I have to keep my winter setup on for upwards of 6 months, I prefer a setup that's visually appealing. Even if it means sacrificing some snow performance, when compared to a 19" wheel with a taller/skinner snow tire.
Anyway, here's what the car looked like on 19's with 265/35/19, in case it helps:
Another option is to get a bigger tire on a 20" wheel. My new Summer setup is a 20" wheel with a 285/30/20 tire. the 285's provide a 6mm increase in overall diameter, providing some extra cushion. But ride comfort feels about the same as OEM, if I'm being honest.
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