Yes I think it is the backplate.
The spacing between backplate and rotor is more on the top and less in the bottom - due to it bending
I do not see any damage on the rotor itself. I did try to bend the backplate (after I got the car back up on the jack), but at no point was it touching the rotor.
I put the old winter wheel back on, drove around and I did not hear and feel any differrence.
THen I put on my summer wheels. Attached arepics showing the whole, top & bottom of rotor (with my new wheels)
You can see the bottom part is closer and the top part has more spacing between rotor and backplate
Thursday, July 2nd, 2009 AT 1:41 PM