Hi guys, I just purchased some vossens for my 2016 Gs f sport rwd.
20x9 in the front +32
20x10 in the back +45 .

i am not lowering the car, just keeping it stock suspension.
i care a lot about a smooth ride and noise etc. I’ve heard so many options on the setup. Like I said all I’m looking for is the best possible ride quality with a decent look. What size and sidewall suggestions etc . Thanks!

 

Get the biggest sidewall you can then. Because if you match a 20" tire to the same height your 19" was it's going to ride rough. I just put my stock wheels and snow tires on replacing my vossens and it's a noticable difference in ride quality and noise. For what it's worth, I have continentals on both sets of wheels and like them.

 

Front 235 35 R20
Rear 275 30 R20

 

245 35 20 is more proportional to 275 30 20 than 235 35 20

 

If you care a lot about smooth ride and noise then don't go with 20s. That's my recommendation and in fact don't go larger than 18. I'd actually prefer 17s. I think the push for massive rims on virtually all cars is one of the dumbest "innovations" of the last twenty years. Sure, I like the way they look and perform but 95% of drivers don't need a track capable street car. I have 18s on my GS350 and it is a fairly harsh ride and I'm constantly aware of potholes and realize I could destroy a wheel at any moment. I already have at least one bent rim though it's not so bad it sticks out and it functions and balances fine. End rant.

 

245/35/20 and 285/30/20 keeps the ratio within 1%. probably will need rear fender roll though.