I was thinking about putting 20's on my R.S. 3! I was just curious how much does the ride change after doing so, also how far is the lip rolled?

 

Having to roll the lip has much more to do with offset than it has to do with diameter. 20" wheels won't require more lip rolling than even a set of 15s if the offset is right. You will become more limited in how low the car can actually go though.

As far as ride, it probably wouldn't be too much different than the 215/35/18s my wife has on her xB depending on what size tire you got. The ride is still very acceptable for a daily driver. You will just want to be more cautious with your driving and take care to avoid pot holes, etc.

 

Thanks! I'm probally going to but my 17's on for now, but hopefully some 20's in a couple of months. I deliver pizza at night so that would make the risk for the wheels a little to great.

 

I did not roll my lip and the 20's are only slightly ruffer that the 17's