Shimano Dura-Ace 7800 10-Speed Rear Derailleur. New wide link design is lighter, more rigid and durable. The increased rigidity stabilizes the chain as it glides up and down the sprockets. Less play means rear indexed shifting is not only quicker, more precise and reliable, but it also insures better indexing over many more road miles.

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180 grams Wide Link Design Increases Rigidity 15 Grams Lighter Than RD-7700 9/10 Speed Compatible