Originally Posted by superchicken_VI
Find out the frame size of the bikes. Somewhere on the internet you can find a static fitting guide for bicycles. You input some measurements and they tell you generally what frame size to get. If either frame is within 2cm of your measurement, buy it and try it.
I'm 5'10, but with extremely long legs for my height. (great thing to have in my running career). The charts say I should be around 48 cm or so.