rear end on 1990 Mercedes-Benz 300CE

my car be sliding & be wearing the back tire what can cause that when i hit a bump it does make a hard noise but the shock are brand new ?

Asked by for the 1990 Mercedes-Benz 300CE
See post above, wheel aliment must meet specification or you will have ire wear. Worn suspension bushings or a bent suspension component will effect tire life and tire wear.