I have ground control adjustable coilovers and just put 17s on my car. I had 16s on for a longtime and everything was fine. Once i got 17s when ever i hit even the smallest dip the two back tires go up in the wheel well (?) and the top of the fender scrapes my brand new tires.
Plus my coilovers are raised all the way.
Ive had a couple people tell me it was the shocks
Any help would be gratefully appreciated

 

What size are the wheels and tires?