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Hey cheers, I have actually been doing the same regarding the head tube, but found all the incorrect size listings started to scramble my brain round that.
With regards to the toptube, is the geo quite square then, so a 58cm top tube will be a 58cm ctc seat tube?
Thanks
1561-
The geo charts are still easy to find online. I'm on my phone right now or else I'd search for you but just give it a Google.
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My MUSA CAAD7 has a 56cm top tube c-c and a 54cm seat tube c-c.
I had the same issue you did with inconsistent charts.
I ride steel frames in 56cm square, so it is a bit more aggressive but works well.
PhilDAS
Juicy8
Since they're both presumably horizontal top tubes, just ask sellers for top tube lengths. It's a more relevant measure of frame size.
The official sizing goes from the centre of the BB to the top tube but some sellers just measure all the way to the top and then give you the wrong size.
Also just find photos of 58s online and then compare the photos to the ones you're looking at buying. I usually use the size of the distance between the top and down tubes on the head tube as an easy reference point to guess sizes