I'm replacing the seat post on an old Atala Grand Prix.
When I put the calipers across the seat tube hole, it reads [avg.] 26.175mm. I'm looking at some Nashbar seat posts I like that come in 26.0 mm or 26.2 mm. Which one should I get?
Put another way, and remembering always I'm a rank amateur. . .
How would I ream the hole bigger for the 26.2mm post? or
How would I shim the 26.0mm post to fit?
Thanks again. . .you folks are great!