Cannondale six13 team MYSTERY

[Tc]

How did they measure their frames c-c ? I’ve got a 2006 frame With original decals saying 56 but the bb has a 58 stamped in it?

 

[rikster]

Re:

https://vintagecannondale.com/year/2006/2006.pdf
Does this help? From the vintagecannondale.com website. Geometry charts for the six13 at the end of the catalogue.

 

[Tc]

Re: Re:

https://vintagecannondale.com/year/2006/2006.pdf
Does this help? From the vintagecannondale.com website. Geometry charts for the six13 at the end of the catalogue.

Thanks I haven’t seen that,

The mystery is the original decals say 56 but the bb is stamped 58 and it looks like a 58 now I’ve got it home, I think I may have to look for a 56 as I think this may be a little large for me at 6ft

 

[rikster]

I think the mystery is the "size - 58" and the the "measured size - 56", so the 56 decal represents the "measured size" from the centre of the bottom bracket to the top of the top tube and the 58 stamped under the bottom bracket is the centre to top of the seat tube measurement.
At least that's my interpretation of the geometry chart, but I have to say that it does seem a bit confusing or maybe it's just me.