Hi all, I'm new to this forum and I apologize if this question has been answered in previous threads. I have a 1995 Corolla and I just put on it a set of 205/50-R16 tires and I'm not sure what is the offset for the wheels. I got the wheels/tires for free from my roommate. My problem is the rear tires are grinding the fenders whenever I hit a tiny bump or a manhole. Worse still, when I have passengers in the backseat, the tires will keep on grinding even when I'm driving on a flat surface. This only happens with the rear tires; I have no problems with the front tires whatsoever. I'm thinking of replacing the stock springs with much stiffer aftermarket ones but I'm not sure if it's going to make any difference. My question is: Are the stock springs too soft and need to be replaced or the wheels/tires are simply too big for the car? My roommate speculates that it's probably has something to do with the car's rear wheel offset being too short. The treads on the outer edge of the rear tires are abnormally worn out and are peeling off due to the grinding (the tires were almost brand new when I got them.) Please advise. Thanks.