Hi there. I have a 2014 RS5 that came with 20" rims, would there be any fittment issues if I was to downsize to a 19"rim off a S4? Would the inside of the rim clear the calipers and rotors?

 

Don't take this at 100 percent but I believe the 20's were an option and 19's were standard so should not be an issue. I also just purchased new winters for my (new to me) 15' RS5 and a lot of 19" options came up when i put the vehicle info into the wheel/tire websites.