Originally Posted by
jimmuller
To answer one of your questions, swapping wheels from 27" to 700c will lower the TT by 0.4cm, which is to say nothing you will notice.
FWIW back then it was more common in the US at least to measure frame size from the center of the BB to the top, not the center, of the ST, or even the top of the seat lug which could be a bit higher than the tube itself. By that measure your bike could even have been called a 62, maybe.
Yeah, center of the BB to top of the top of the seat tube was the de facto standard. So 62 or so is right. Some would measure to the actual top of the seat tube lug, others would use the imaginary intersection of the top of the top tube and the center of the seat tube.
Center to center was the oddball way.
If you can stand over the bike and lift it up a little, ideally around an inch, than it is OK. If you can't get your heels on the ground, get another bike. 5' 11" would normally fit around a 58 on average.