Join Date: Jun 2010
Location: NW,Oregon Coast
Mentioned: 25 Post(s)
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need more data.. length of top tube and 'size' are not a locked together proportion..
when top tubes are not level, as I see that is not, seek out the virtual top tube length.
which is between the center lines through the seat and headtube,
parallel to a horizontal top tube, as if, it had one.
so a level top tube may be adding an inch or so to seat tube length,
and 'size' is often seat tube, center of BB to top of seat tube, length.
Last edited by fietsbob; 03-15-12 at 12:15 PM.