The GRX derailleur is available as 10 speed (RD-RX400) or 11 speed (RD-RX810) versions. The 10 speed is compatible with Tiagra 4700 which has the same cable pull as 11 speed, so is there actually any practical difference between the two other than weight?
I was hoping I could use the RD-RX400 with an ultegra 6800 drivetrain - it's a much cheaper way of getting a clutched derailleur - and it seems to be theoretically possible. Is there anything I'm missing or should this work?
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