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Ultegra Di2 RD-R8050 Rear Derailleur

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MSRP $269.99
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Backorder: This item is currently out of stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). We can not accept Paypal for backorder items (credit card checkout, only). Your credit card will not be charged until your item ships. Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

Silent as a shadow.

With Shimano's new Shadow technology at play in their redesigned Ultegra Di2 Derailleur, Shimano is ensuring that you get effortlessly easy, intuitive shifting all ride long. With a redesigned body, the Ultegra RD-R8050's sleek integrated appearance and optimized slant angle improve the responsiveness, performance, and stability of shifts. With their Synchronized Shift technology, the front and rear derailleurs communicate with each other to ensure that you're always in the optimal gear placement, shifting the front derailleur automatically with the rear, or vice versa.

The Shimano Ultegra Di2 RD-R8050 Rear Derailleur is available in two sizes, the Short Cage SS version will accept up to a 30T rear sprocket, while the Medium Cage GS version will accept up to a 34T sprocket.


  • Redesigned rear derailleur features low-profile sleek body with optimized slant angle.
  • Shimano Synchronized Shift technology ensures you're always in the optimal gear placement.
  • RD-SS covers 11-25t to 11-30t.
  • RD-GS covers 11-28t to 11-34t.
  • Claimed weight: 242g (SS), 249g (GS).
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