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I am trying to be budget friendly and recycle parts for a new project.

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The GRX ST-RX400 is compatible with the Tiagra RD-4700, which means it is using the 11-speed cable pull, making it incompatible with 10-speed road RD such as the Dura-Ace RD-7900.

Here is an excerpt from the Shimano compatibility chart:

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And from BikeGremlin RD compatibility article, about the Tiagra 4700 pull ratio:

[...] Tiagra 4700 10 speed road RD – it has the same shift ratio as Shimano road 11 speed RDs [...] Another exception is the new “gravel” group (with hydraulic brakes): Shimano GRX. Cable pull wise it’s the same as Tiagra 4700.

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  • Could you add a link to that compatibility chart? May 7, 2023 at 12:20
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    @user2705196 I edited my answer to include it and the reference to the Tiagra 4700 cable pull ratio.
    – olliebulle
    May 7, 2023 at 12:34

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