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Don't measure the headtube, measure the Stack and Reach.
Headtube size are usually determined by the fork length and headset, a CX bicycle (Genesis Croix de Fer 54cm) with 135mm headtube have about the same height as a Cannondale CAAD10 with 155mm in 56cm.
Also bottom bracket height can make a difference, a lower BB would make the headtube feel taller, whether a higher BB will make it feel smaller.
edscoble
I think its the fact I dont want 30mm+ of spacers. The head tube is a small 155mm on a 56 Caad10. I dont bend that well.