CLICK HERE to join our Email List and get 15% off your first order*
*Restrictions Apply. Click for details.
Signin to Your Account
Questions? Call our tri Specialists! 1-800-445-4790


Product Images

Shimano GRX RD-RX815 11-Speed Di2 Rear Derailleur
Click to zoom

Shimano GRX RD-RX815 11-Speed Di2 Rear Derailleur

Pricing and Order Section

Mfg PartNum: IRDRX815
(1 customer reviews)
Sale Ends
Purchase this popular item
today and save 35%
Earn $3.90 in Podium Club credit. Click to Learn More.
SALE: $194.99
MSRP: $299.99
SAVE 35%
In Stock Now
This color/size is not eligible for Podium Club points
Price matches are is not eligible for Podium Club points
Qualifies for Free Shipping!


GRX RD-RX815 11-Speed Di2 Rear Derailleur

The Shimano GRX 11-Speed Di2 rear derailleur brings mountain bike technology to gravel riding with a clutch equipped rear derailleur allowing smooth shifting on rough terrain. The Shadow RD Technology utilizes it's race-proven, low-profile design to offer a derailleur that is more compact and fits closer to the frame, ensuring less damage in a crash. With the adjustable chain stabilizer, chain slapping and dropping are prevented while the gravel-tuned clutch tension provides silent and uninterrupted electronic rear shifting on the roughest terrain.


  • Operates with Shimano Di2 for digital electronic shifting
  • Toggle clutch ON/OFF to match the terrain
  • Gravel-tuned clutch tension provides smooth and reliable mixed surface shifting
  • Switch stabilizer ON/OFF to match the terrain
  • For 1x and 2x drivetrains

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.



Mfg PartNum: RD-RX815 




Total Capacity: 38T 


Max. front difference: 17T 


Top sprocket: 11T/Min. 11T 


Low sprocket: Max. 34T/Min. 30T 


Top-Normal Spring Type: SHADOW RD plus 


Weight: 287 g 


Actuation: Electronic 


Discipline: Road/Gravel 


Mount Type: Standard Rear Hanger 


Speed: 11 


Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Shimano simply the best
by Anonymous
1 of 1 customers found this review helpful.

Great DI2 rear derailleur changed to the GRX from Dura Ace it's every bit as good and handles the wider range cassette with ease

Reviewed 6/1/2023
Was this review useful to you? Yes/No
Thank you for your feedback.
additional content loading
additional content loading
additional content loading