The person selling the Waterford mixte I'm looking at says the seat tube to middle of crank is 17". I compared that to the three bikes I have and I see that all my bikes have different tube lengths. My smallest bike has a 17.5 seat tube ( and that bike is probably too small normally, but the mechanic and raised the handle bar to it's safe max AND added a top of handlebar that has more rise and that bike fits so well. Supposedly that's equivalent to aa 47cm bike.
My electric cargo bike is a mixte designs and it's meant for all heights. That seat tube is like 15" and then my small Surly Ogre is 16"
Here is a picture of the bike I'm asking about.