5-3540 520 Works Aluminum Rear Sprocket

Hard Ano Works Triplestar Aluminum rear sprocket - featuring hard anodized coating for extra strength & durability.
Classic Sunstar 'works' finish, made from 7075-T6 aerospace grade aluminum for light weight with mud grooves at the base of the tooth area on the front side only.
Together with our exclusive tooth-valley design, this allows for up to 50% more chain roller contact area, leading to longer life out of your drive components.
Used by championship level riders & teams for over 25 years & counting.