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Shimano GRX rear derailleur

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?

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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