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Yes, IS to Post adapters. They are specced for certain rotor sizes so include 140 in your search.
Surly have a FAQ section where people asked the same question. They all mention 160mm rotors though so not sure if 140mm will work (unsolicited opinion: personally would run 160 especially if you're bikepacking/touring offroad).
picklejuice
@KarlMarx
Wondering if anyone in here can help. Got a Straggler frameset with I.S. tabs to mount brakes on.
I have a Rival Hydro groupset with post-mount calipers that I want to transfer to the Straggler. I am guessing I need IS > Post-mount adapters for the front fork and the rear of the frame.
Thing is, I can't work out what size adapter is needed - my rotors are both 140mm. Anyone got a clue?