Hydraulic caliper compatibility question

Hairsy
Hairsy Posts: 16
edited November 2017 in Workshop
I have bought a second hand set of Shimano ST-RS685 shifters to convert my mechanical disc setup with hydraulic.

I need a set of post mount calipers to go with the shifters and would appreciate advice on what compatibility issues there could be. Can I use any set of Shimano post mount calipers or are there factors that make some models incompatible? Is there a material difference between calipers that are sold for MTB rather than road?

Many thanks

Dave

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