S9

Circle riveting: Extremely high pin power.
Bushingless: New technology aids in smooth shift tranmission without binding.
DHA pin: A chromium hardened pin coated by a special chromium carbide layer.
Inner chanfer: On inner plate and outer plate is for anti-drop of chain caused in back pedaling situations.
Outer chanfer: The chamfer is at the end of the outer link and reduces shift friction by 80%.
Noiseless: It guarantees smoothness even at the moment of change.