Joined: Jul 2006
Posts: 9,158
Likes: 1,743
From: Lebanon (Liberty Hill), CT
Bikes: Canyon Aeroad, CAAD 12, MASI Gran Criterium S, Colnago World Cup CX, Guru steel & Guru Photon
[QUOTE=_ForceD_;23543601
In looking for ways to measure, I’m seeing the phrase “effective top tube,” but not a complete explanation. Would that be a level (imaginary) line from the top of the head tube to the seat post? (Then measure from that point on the seat tube down to the center of the BB?) — Dan[/QUOTE]
That's basically what I do. My sweet spot is a 54/55 frame with 55 TT. I put my bike on a level floor and measure as you describe. Works perfectly for me.