Originally Posted by
dddd
I'm thinking you meant that 27.4mm would indicate a frame with 753 seat tube(?).
If a 27.2mm seatpost or two don't fit in the frame then it is sized smaller than 27.2mm.
I have at least one example of just about about every size of seatpost on hand, so always use a post as a guage.
I have in a couple of instances used a particular one-size-larger post in a frame whose printed specifications and supplied post both were a smaller size.
Nope. 27.0 was often used in Metric 753. Depended on the size of the frame. My Raleigh Team Pro uses 27.0mm. Imperial 753, which was introduced around 1983, would be 27.2 or 27.4mm. It is more likely the amateur repaint caused a buildup or it is just pinched. So now I am wondering why I even posted the original comment.