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How tall are you
This really is the wrong question to ask because:
The current owner might be riding the wrong size (not saying they are but it's always a possibility)
You might be the same height but be "long" in different places, e.g. long legs and short torso
You might be the same height and shape but looking for a different kind of ride (more racing or more touring)
Anyways, great bike glws
How tall are you trying to work out the top tube compare with the shorter seattube. I normally run a 54 -54 with a setback seatpost and a 100mm stem
Lovely build.