Regarding the issue of Soma Stanyan head tube size. I just did some measuring on a couple of my bikes. My Stanyan is a nominal 58 cm frame but the actual center to top of top tube measures close to 57 cm. The head tube is 140 mm long. I have an old 1982 Trek (read about it here: http://www.bikeforums.net/showthread...43-My-old-Trek ) that measures 58 cm center to top of top tube and it has a head tube length of 145 mm.

These are so close that I see no real difference, especially considering that the Stanyan frame is slightly smaller c - t.