Just noticed it yesterday. The right rear makes a strange rattling noise when I go over bumps with just that tire. Sounds like a "2 washers in a small can" kind of sound. Big bumps don't seem to make the noise, just rough pavement, like patched pot holes. Speed bumps won't duplicate the noise either no matter how fast or slow I go over them. Sounds like my old heat shield problem from my other cars, but I checked them all out, nothing seems out of whack. I have HFP suspension and Comptech rear sway and camber kit by SPC.