Forget height. Measure your inseam in CM. Roughly 2/3 of that will put you in the ballpark for frame size. Having said that, the proportionality of your body dimensions can make a difference. My inseam is 32.5" in CM that's 82.55. So, my frame size should be around 55. My body is pretty proportional so a 55 with 55 TT is perfect for me. And, has been for 40 years.