Pegoretti seatpost question

[eolson124]

I'm building up a 2015 Pegoretti Marcello. A 31.6 seatpost is too big to slide into the main tube (without undue force). With a 30.9 seatpost, I need to tighten the seatclamp with a lot of force, in order to keep the seatpost from sliding.

I'm worried about bearing down on the seat clamp. Is this an issue?

Thanks. EWO

[Louis]

Have you verified that your 31.6 post truly is 31.6 and not a bit more than that?

Or that the seat tube diameter is ~31.6?

According to the link below, the Marcelo should take a 31.6 post.

https://www.bikyle.com/PegGeometry.htm#Sizings

[bart998]

Sounds like the frame is intended to take a 31.6mm post. You may have paint, slag, etc. inside the tube reducing the clearance. Take it to a good shop/frame builder and have it reamed out to the correct size.