Bicycle sizing for my girlfriend..

[Triskeliongirl]

Height is only one paramater. I am 5'4.5" tall, and have long femurs and a short upper body. My best fitting bike is a 19" terry road bike with a 49cm TT. I also need a slack STA (73 degree or less) to fit my long femurs, and even then my saddle is all the way back on a very laid back seat post. This is another reason I need such a short top tube, I sitting further back than most, increasing my reach.

I could never ride a bike with a 54 cm top tube!