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Shimano Ultegra DI2 RD-R8050 Rear Derailleur

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The latest Ultegra Di2 group from Shimano boasts impressive refinements. While a full Dura-Ace build is always desirable, there is little discernible difference in performance. This is due to Ultegra's use of trickle down technology from Dura-Ace, including the Shadow design for the RD-R8050 rear derailleur. The low profile design places the derailleur closer to the frame and under the cassette, providing protection in case of a crash and ensuring smooth, quick, and accurate shifts. The updated geometry of the RD-8050 allows for shorter throws, resulting in faster and more precise shifts, especially over a wider range of 11-34 cassette.


- Sleek integrated appearance
- New low-profile design
- Shimano Shadow RD
- Race endurance
- Optimized slant angle
- Maintain race concentration with more intuitive shift control
- System communication with front derailleur
- Shimano Synchronized Shift
- Wide compatibility
- Short cage covers: 11-25T to 11-30T
- Medium cage covers: 11-28T to 11-34T
- Average Weight: 242 grams (SS type), 249 grams (GS type)

Return Policy

Please email for returns, defects or order issues. Do not contact our chat support.

Final Sale

Items marked Final Sale are not returnable for any reason.  If there is a problem with your order please send an email to

Our Policy

To provide our customers with the flexibility and confidence to shop online, our return policy is 30 days. If opened, items must be defective or unused, and returned with original undamaged packaging to be eligible for a refund. All returns must be pre-approved via our return centre before being shipped back to our warehouse or returned in person to our 2205 West 1st location in Vancouver. Refunds can take up to 7 days to process and are reflected on your method of payment. Refunds will only be issued once the product is received, inspected, and approved by our receiving team. The amount will be refunded to the original form of payment and, in some circumstances, we may charge a restocking fee or refund to store credit. The date on which you placed your order is used to determine the return time frame.

Returns, not exchanges.

We do not offer exchanges. If you are looking for another size or colour, place a new order through our website, and then visit our return centre.

Shipping and Fulfilment

Order Fulfilment, Delivery, and Local Pick-up:

In-stock orders will be ready for pickup within 24-48hrs. Please wait for confirmation email prior to pickup.

In-stock orders will be shipped within 24-48 hours of placement.

For local pick-up, we will contact you when your item is ready. Please bring a copy of your order confirmation and identification when you pick up your order.

Shimano Ultegra DI2 RD-R8050 Rear Derailleur