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Shimano Ultegra Di2 RD-RX805 Rear Derailleur
Shimano Ultegra Di2 RD-RX805 Rear Derailleur
Shimano Ultegra Di2 RD-RX805 Rear Derailleur


Shimano Ultegra Di2 RD-RX805 Rear Derailleur

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The Ultegra RX Rear Derailleur brings Shimanos’ chain stabilizing technology road cycling drivetrains, delivering smooth and precise shifting over technical terrain. It expands road bike capabilities, inspiring confidence on any surface and drives the evolution of road cycling to include greater elements of adventure. The Ultegra RX Rear Derailleur is available in 11-speed Mechanical or Di2 compatible options.


  • Shimano Shadow RD+ chain stabilizer mechanism

  • On/Off switch

  • Compatible with current road Dual Control Levers

  • Direct Mount Compatible

  • Designed for use on 2x11-speed Di2 electronic system

  • Rear Derailleur Mount Type: Shimano Rear Direct Mount , 10x1 Standard

  • Drivetrain Speeds: 11

  • Cage Length: Medium

  • Chain Wrap Capacity (teeth): 39 teeth

  • Largest Cog: 34

  • Color: Black

  • Weight: 280 g

  • Rear Der/Shifter Compatibility: Shimano Road Di2

    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-RX805 Rear Derailleur
    Shimano Ultegra Di2 RD-RX805 Rear Derailleur
    Shimano Ultegra Di2 RD-RX805 Rear Derailleur