Rear Derailleur (2x)

RD-RX815 - Rear Derailleur (2x) image
  1. Specifications
  2. Shopping Links

If you've been looking at GRX Di2 components you may have seen that there are two rear deraileurs. This RD-RX815 and the RD-RX817. While the RD-RX817 supports a greater cassette range of 11-42T, that specific derailleur is not meant to be used with a front derailleur. It is the 1x-only GRX rear derailleur.

So if you want to use GRX Di2 and run a front derailleur, this RD-RX815 is the way to go. It has a total capacity of 38T, with a top sprocket max of 11T and a low sprocket max of 34T (min 30T).

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

Model number:
RD-RX815
Weight:
287 g
E-Tube ports:
1
E-Tube Port type:
SD50
Type:
Rear Derailleur
Series:
GRX RX815 (Gravel)
Downloads:

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
The Pro's Closet