GRX di2

t_willo

Hello guys,

Does anyone have any experience with running the 817 rear mech in a 2x set up? Does it, will it work with the right rear cassette?

BetterShifting_Terry

Even though this is a 1x rear derailleur, Shimano hasn't blocked that in firmware. You can use it in a 2x setup.

Keep in mind though, that synchronized shift will not work. Shimano has not enabled synchro shift for this RD, because it was not designed to be used with a front derailleur.

According to the specs, it doesn't really have the total capacity to be used with a front derailleur. Still, people do use it in 2x mode, and they seem to be OK:

https://www.bikeforums.net/cyclocross-gravelbiking-recreational/1202262-grx-di2.html