Originally Posted by
unterhausen
I am pretty sure that seat post is too small. As I said in the C&V thread, it would be helpful if you measured the seat tube down where it's not smooshed. But as Clifford says, getting a bigger seatpost would be a good test. My LBS has a collection of old seatposts, but maybe try a coop?
27.2 posts are pretty common. Co-ops, thrift stores, laying on the side of the street?
Open the slot and see if it fits.
Then, if it is binding more than you're comfortable, you can sand it down by 0.1mm or so all around (0.2mm total).
Either that, or if it is very close, hone the seat tube.
Lots of 27.0 posts on E-Bay. Some vintage ones too, if you don't need it too long.
https://www.ebay.com/itm/SR-Laprade-...n/254172332587