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Shimano Ultegra Di2 RD-R8050 Rear Derailleur

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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.

The Shimano Ultegra Di2 RD-R8050 Rear Derailleur features a redesigned body that increases shift stability and improves the aesthetics delivering a sleek, integrated appearance. With the new optimized slant angle of the rear derailleur, the new Di2 ensures smooth, silent, and effortless electronic shifting.

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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Reviewed 4/12/2018
by davidshiloh4
Cycling Enthusiast
Denver, Co
Value Rating
Overall Rating

I've had this for a few weeks and so far it is Flawless. It shifts great and gives you the ability to have an 11-34 cassette which works great in the Denver area where we love to climb mountains.

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