Renthal Rear Sprocket Hard Anodised Grooved 456 / 520Renthal Ultralight Hard Anodised Rear Chainwheels are specifically designed for Street and road racing applications. CNC machined from the same 7075 T6 material as our offroad chainwheels, with increased longevity from the hard anodising finish. Hard anodising is an integral surface coating which significantly increases the surface hardness and wear resistance of the rear sprocket. Typically available in Ultralight or Race Conversion pitches and a