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Are hourglass shaped headtubes better that plain ones? Also if bottom and top tubes are joined together into a monocoque-like shape together with the headtube is it a good sign for strength and durability on the frame? The weld on my frame is 4cm long (the one that joins top and bottom tube.)
 

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Hourglass shape versus traditional shape shouldn't make much of a strength difference if properly designed/welded. The headtube is pretty short overall so its pretty strong regardless of hourglass or traditional.
 

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The hourglass shape often lends to lighter weight or an internal headset. Others are like that just for looks. I don't think it's much of a strength issue. As for the top and downtube being welded together, I believe it's one of those "6 to one, half-dozen to another situations". Both have been done many times, and many ways. with no clear winner.
 
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