Anyone know what size seatpost an '08 Madison takes? The spec sheet says 27.2,
using the search button showed someone used a 27.0.
I'm wanting a Thomson seatpost, if that matters. Thanks for any help!

Pull out you post and check. Some came with 27.0 and some came with 27.2. Mine came with 27.0 but was a tad small. 27.2 was too big.

To i used some steel wool in the seat tube to ream it and 27.2 now fits