Originally Posted by
neil0502
At the risk of asking a naive question, though: it would seem that one of the pieces (seatpost, seat tube) or both are out of round.
If the TUBE was a pretty clean 27.2, then I'm not sure I'd want to hone it out (oversize it) unless I intentionally moved up to the next stock diameter of post. Otherwise, replacing the post WITH a new 27.2 might involve a too-loose fit situation.
That's why -- if I couldn't verify which one WAS actually off -- I'd probably work the post.
Thoughts?
yeah, I would'nt want to go in there and ream, or resize a seat tube, especially with a drill motor and abrasive balls. I also dont think the seat tube or seat post is out of round. If there's any discrepency I would think it would be in the seat collar area where it tightens against the post. Either that or its corroded inside the seat tube. After years of tightening and re-tightening it could've gotten slightly out of round right there at the point.
I would try taking an old spoke with the j-bend end bent tight onto a rag soaked with "pb-blaster". Ball the rag up to where it fits firm inside the seat tube and swab out the seat tube. The pb-blaster will clean up any corrosion inside the seat tube. I would do that first before permanently altering the internal deminsions of the seat tube with abrasive balls.