De rosa Neo primato Genius and merckx team sc seat post diameters

Atm00vint

Retro Newbie
Hi,

Anybody could help me to know if they are 27.0 or 27.2?

I’m trying to install as a test a 27.2 no seat back I have and it seems quite difficult in both (don’t want to damage the seat post or apeciakly frames forcing). I doubt if they are 27.0 or maybe the seat post is wrong.

As the De Rosa has not clamp I prefer to ask before trying other methods like opening a bit; and so in.

Thanks in advance!!!

Btw theese are the bikes: IMG_2538_Original.webp IMG_3418.webp
 

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