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Shimano MTB calipers with hydraulic STI levers?


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I was wondering if there is any official guidance on whether one is able to pair Shimano's hydraulic MTB calipers with hydro STI levers? My frame has a post mount setup and it seems that Shimano's offering of road bike calipers with PM option is limited. 

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Here is the official answer:


BR-RS785 is the only officially compatible post mount caliper. I've seen some claims that it is just a renamed XT M785 caliper and as such should be entirely compatible with any other mtb caliper, but I don't know if that's true.

I'm thinking about getting the Tiagra or GRX RX400 hydraulic STIs and maybe Deore calipers myself, but I'll wait a bit and see what combinations other people will try first.

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