It is a mixed bag as there are exceptions to what sizes have a double top tube. I have a 65cm A. Homer Hilsen (MUSA) that is a single top tube. I did not request a single top tube, as I purhcased it from Rivendell after it was built. The bike may be a little big for me, but the secondary market for steel bike with rim brakes has taken a dive, so not selling right now.
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