I'm getting more confused the more I read. Yes the 53 has a 545mm ETT which is what I have on my current road bike, and the 55 has a 565mm ETT. I have found a 53 and 55 frame for sale. Seems like the 53 would be the way to go but I have read that the Lemonds have shallow seat tube angles so it makes the top tube/reach seem shorter than it actually is. I think 545mm ETT is the shortest I can go so that worries me that the 53 will feel too cramped even if the ETT is the same as on my current frame