
The PBR ultra-light C45 steel sprocket 4690 (520) is designed for motocross riders looking for a robust and compact component for their transmission. Developed in collaboration with WMX champion Kiara Fontanesi, this sprocket features a lightweight design with technical solutions dedicated to reducing weight without apparent compromise on mechanical strength.
The lightweight drilling and CNC machining give this sprocket a technical and refined look while reducing unsprung mass — a noticeable advantage in acceleration and corner exit. Its galvanized treatment provides protection against corrosion, useful in muddy and wet conditions encountered in motocross.
Compatibility and application examples: ideal for lightweight motocross and enduro machines. Top 3 motorcycles frequently equipped with this reference: