
EK/PBR 520MRD7 13/49 Chain Kit - ultra-light sprocket: a chain kit designed for motocross bikes where every gram and every link matters. This 520 setup in gold finish combines a high-strength chain with an ultra-light aluminum sprocket to reduce unsprung mass and keep the transmission responsive without compromising wear resistance.
Designed for motocross and competition use, this EK kit is aimed at riders looking for a lightweight and durable setup for their trajectories and accelerations. Ideal for models such as HONDA CRF 450 RWE (2026), CRF 450 R (2026), and CRF 450 R (PE07) (2020) — check the exact fit for your machine before installation. Installation and tension should be checked regularly: a well-adjusted transmission prolongs lifespan and maintains the efficiency of the final drive.