The JT TwinStar Rear Sprocket has seen considerable development in producing the lightest, most durable bi-metal sprocket on the market today. The core of the JT TwinStar is a lightweight aviation grade Ergal 7075-T6 Aluminum, precision made using state of the art laser cutting and CNC machining. The steel outer ring is heat-induction hardened to create a sprocket which will last up to six times longer than a standard 7075-T6 aluminum sprocket. An extensive test program which included top level Motocross events and the 2020 Dakar Rally have proven the final product. The TwinStar Rear Sprocket embodies all the qualities that make JT Sprockets the World leader, with ultimate performance and unbeatable value.