Okay, I responded to Surly and they replied back. At least 65mm should be in the frame.. a campy 2 bolt has a limit line at 58mm... so there you have it.
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear