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For old Treks, 27.2 is the most common, but for other bikes the diameters can range from 25mm to 33mm.
Also gathered on this page are date codes decoded and generously provided by others.
Even those equipped with Suntour Superbe components usually had SR seatposts.
Many components are marked with size descriptors in addition to component manufacturer's date codes.
As the wear on a vintage bike increases, the greater the likelihood components are not original, either through replacement of worn parts or through component swaps.
Swaps can take place early in the life of a bike as the proud new owner upgrades to new or used components of higher quality.
Pull the lever and look inside the top of the lever arm for a code such as "1084." Dia-Compe extension levers (yuck) also tend to have date codes on the side that faces the brake hood.