DID, Japanese quality GOLD ER series race chain.
We only stock Road Racing models of the ER series:
415 ER for the 125 GP and Moto 3 super lightweight machines. (Non ring)
520ER for lightweight Road Racing machines such as 250GP, Lightweight production (250-300 ninja etc) (non ring)
520ERV3 The Daddy of the range designed for higher powered Road Race Machines 600 cc plus (Xring)