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Discussion Starter · #1 ·
I have a quick question. Where is the frame measurement taken on a bike when one says it is 52 cm? Is it from the ground to the top tube? I have a friend who will probably be looking for a used bike, and I need to get a ballpark on her size. I'm not positive of the size on my bike, except it is a small (roughly 52 cm, I think). Thanks!
 

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Discussion Starter · #3 ·
O.K. More complicated than I wanted. I do realize it isn't standardized, but I wanted to be able to get a ballpark. I guess I'll just make a few measurements on my bike and compare a bit. She is about my height (or slightly taller), but she has a shorter torso than I do (so she says!). I think our inseams are very close to the same, though, because we wear the same size and generally have to hem everything! LOL
 

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they will generally annotate the geometry chart to say if it is center to center or center to top. In any event, the horizontal top tube measure is more important
 
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