Aero 53 Series Black Powdercoat Roll-Formed Beadlock WISSOTA-Approved Race Wheels 53-185040W - Free Shipping on Orders Over $49 at Summit Racing
this is a bead lock rim commonly used in off road racing to keep the bead from comming off and allowing the tire to lose air. The outer collored ring unbolts then you moutnthe tire and rebolt the ring