31.5mm more than whatever drop your 700c frame uses. ((622-559)/2)
Tektro R556 go up to 73mm and Alhongas up to 75mm, so you may be OK so long as your existing frame is a close clearance one (standard road calipers use a 39-49mm range).
thanks! there were no brakes on the frame when i got it, so i can't work it out from that. the frame's being powder coated at the moment, so i'll have to wait for it to come back to measure it.
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