
EK/PBR 420SR Chain Kit 15/48 - Standard Sprocket
Designed for small urban motorcycles, this EK CHAIN kit combines a 15-tooth sprocket and a 48-tooth rear sprocket to easily replace the original transmission. The SR series benefits from a specific heat treatment of the plates, ensuring excellent durability and maintained flexibility even after prolonged use — a practical advantage for frequent starts and stop & go traffic.
Easy installation for the mentioned 50cc road and supermotard models: RIEJU SMX 50 (2001-2002), RIEJU MRX 50 (2002). This kit is aimed at urban riders looking for a robust and easy-to-maintain part to keep a reliable transmission for daily use. Always check the exact compatibility with your model before installation.