DID PBR Chain Kit 520VX3 13 48 Standard Standard Rear Sprocket Benefits for the CRF125F Yoshimura Benefits for the CRF125F Yoshimura RS 9T system include: Hub made of 1 piece billet 6082 aluminium Pin Length: 0 Chain 520VX3: The VX Series chain is a great chain upgrade from OEM and is our most popular and widely used chain on both on and off road bikes