"Doesn't have to be 27.2 mm seatpost to be legit Reynolds 531."
true, but I don't think this has metric 531 tubing (because it's not French nor Spanish), and 99% of Imperial 531 seat tubes were reamed to 27.2...there will always be exceptions but I don't think this is one.
Last edited by unworthy1; 10-19-11 at 09:16 AM.