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Shimano GRX RD-RX817 11-Speed Di2 Rear Derailleur
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Shimano GRX RD-RX817 11-Speed Di2 Rear Derailleur

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Mfg PartNum: IRDRX817
(1 customer reviews)
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The Shimano GRX 11-speed Di2 rear derailleur integrates electronic shifting with silent and uninterrupted rear operation on rough terrain. An adjustable Shimano Shadow RD+ clutch prevents chain slapping and drops.

•Operates with Shimano Di2 for digital electronic shifting
•Gravel-tuned clutch tension provides smooth and reliable mixed surface shifting
•For 1x 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%.



Model Number: RD-RX817 




Weight: 318 g


Direct Attachment: Yes 


E-tube connector (pcs): 


E-tube port (pcs): 


Firmware update by E-TUBE Project: Yes 


Fluoric coated link bushings: 


Low sprocket: 42T (max) / 40T (min) 


Sealed bearing guide pulley: Yes 


Sealed bearing tension pulley: Yes 


Top-Normal Spring Type: SHADOW RD plus 


Top sprocket: 11T (Max/Min) 


Total Capacity: 31T 


Actuation: Electronic 


Discipline: Road/Gravel 


Mount Type: Standard Rear Hanger 


Speed: 11 


Ordered by Most Relevant First
5 stars
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1 stars
It does what Shimano says, AND MORE!
Cycling Enthusiast
Seattle area
1 of 1 customers found this review helpful.

I installed this on my Co-Motion Tandem, running DI2 Ultegra 8070 group. First, being a tandem, a wide gear range is needed. Second, road DI2 only runs 2X drivetrains. Third, I use a FSA Gossamer triple crankset, using only the middle and big rings as a double. This means the smallest available chainring is a 39T ring. I run an 11-40 SRAM cassette. The GRX RD-RX817 11-Speed Di2 Rear Derailleur is spec'd to run an 11-40 or 11-42 cassette, but for a 1X drivetrain. Well, the drivetrain shifts super smooth now! It works flawlessly with the 2X drivetrain, including the auto shift functions. It's well worth the money.

Reviewed 10/12/2020
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