Newly designed outer and inner plates for better contact with gear teeth. New shaped outer plate for less chain suck. Smoother shifting, even under high load shifting. Higher pedaling efficiency 0.6% better compared to 7800, and silent pedaling for less stress. Hollow pin and perforated plate for weight savings. Enhanced parts size around the pin result in less flex when shifting to. Uses a pin for a consistent, secure connection. Manufacturer CN 7900. Width 6.1mm. 251 grams
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