Hi My S4 Avant 1999, is wearing its rear tyres on the inside edges, both sides the same. Any particular bushes /arms that failure of can cause this ? Since i bought the car (6months ago) i have suspected the back is a small bit "clonky" when applying power on /off in normal driving. Sometimes after hard accelaration, when easing off, it has on some occasions felt like the back end had "unwinded" . Hard to describe, but perhaps linked to the tyre wear?