Robbie asked: greetings
did early 80s mercier take 27.0 or 27.2 seat post.
thanks robbie fellows
The appropriate thing to do here is take the frame to a competent local bike shop, where they will have a tool that is a stepped cone sized at every .2 mm that will show exactly what size fits.
Remember what Sutherland quotes at the beginning of his manual: One measurement is worth 1,000 expert opinions.
Earle Young
Madison, WI