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@meisteris
Good notice! I am not 100% sure about how to measure. These Sora brakes do have 49mm arms indeed. However the drop measured from the center bolt to the middle of the brake pad is exactly 57mm and could go even lower than that, so they might be OK. I guess we will find out as soon as the frame arrives.
Doing quick search about the topic:
Measuring caliper brake "drop"
Sheldon Brown ABC