Rear Derailleur (1x)

RD-RX817 - Rear Derailleur (1x) image

If you've been looking at GRX Di2 components you may have seen that there are two rear deraileurs. This RD-RX817 and its lightweight cousin, the RD-RX815.

The RD-RX817 was developed by Shimano specifically for use in 1x bikes. This means that running this rear derailleur with a front derailleur is officially not supported. There are reports of users installing a front derailleur anyway, like this user on bikeforums.com. If you do, keep in mind that this is not Shimano approved and your experience (and possibly safety) could suffer.

This RD-RX817 has a total capacity of 31T, allowing you to run an 11-42T cassette. Its top sprocket max is 11T and the low sprocket max is 42T (min 40T).

Both GRX rear derailleurs feature a clutch mechanism, just like the Ultegra RD-RX805 and the mountain bike rear derailleurs. Shimano call this the chain stabiliser. It can be adjusted and prevents chain slapping (or worse, dropping your chain).

Details & Specifications

Shimano model number:RD-RX817
Weight:318 g
E-Tube ports:1
E-Tube Port type:SD50
Type:Rear Derailleur
Component series:GRX RX815 (Gravel)
Downloads:Di2 Rear Derailleur User Manual
GRX RX815 Dealer Manual

Shopping links

Are you looking to upgrade your bike using this component or tool? I've added links to this component's shopping pages. If you make any purchase using the links below you'll support the site - at no cost to you.

Ebay
Wiggle
Amazon

Related Components

If you're interested in this Rear Derailleur (1x) you might also want to take a look at these components:

Related pages

Have a look at these pages - I think they could be useful if you are looking at this Rear Derailleur (1x).