
PBR Standard Steel Sprocket 4391 - 420: designed from competitive experience for urban transmissions. This 50-tooth sprocket is aimed at riders looking for a robust and reliable replacement part for drivetrains equipped with a 420 chain.
Manufactured according to demanding processes derived from competition, this PBR sprocket offers geometry and finish suitable for urban use and standard replacements. It mounts in place of compatible original 420 sprockets without specific modifications to the drivetrain.
Common compatibilities:
A simple and robust sprocket to maintain the transmission of your 50 cc in an urban environment while preserving the alignment and reliability of the final drive.