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She's got a GRX RD - does MTB also not work with GRX?
I love Shimano but fuck their fake limitations.
hippy-
GRX is considered ‘road’, and therefor won’t work with MTB.
The only real limitation is that the derailleurs you use have to be either road/gravel or mountain bike derailleurs – you cannot mix these derailleurs.
https://bettershifting.com/di2-compatibility-mix-ultegra-dura-ace-xtr-xt-and-grx-components/
Tijs
Shimano Di2 Road and MTB derailleurs don’t work together, right?