
The EK/PBR 420SR 13/53 chain kit is a transmission set designed for urban use on small-displacement motorcycles. It includes a 13-tooth sprocket and a standard 53-tooth rear sprocket mounted on a chain with a pitch of 420. The SR series is distinguished by a specific heat treatment of the plates that maintains the flexibility of the chain even after extensive use, while increasing the mechanical strength of the components.
This kit is aimed at riders looking for a robust and flexible chain for daily urban use: short trips, frequent stops, and changing conditions. Easy to install during routine maintenance, it offers compatibility with the 50 cc models listed below, without altering the original geometry.