
Designed for urban use, the EK/PBR 420SR 12/47 chain kit combines a 420 SR chain and a standard steel sprocket to effectively replace your transmission. The SR series benefits from a specific heat treatment of the plates, aimed at improving durability and wear resistance while maintaining good flexibility during riding.
This kit is particularly suitable for mopeds and small displacement bikes oriented towards city use. Before installation, check the tension, alignment, and condition of the seals; regular lubrication extends the lifespan of the chain. Compatibility examples: RIEJU RS2 50 MATRIX PRO (2010), RIEJU RS2 50 NAKED (2009), RIEJU NKD 50 (2007).