Older Schwinns had a 13/16″ seat post. Other bikes generally 7/8″ but there are other sizes also. Shims can be used if the seat post is smaller than the seat tube.
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Older Schwinns had a 13/16″ seat post. Other bikes generally 7/8″ but there are other sizes also. Shims can be used if the seat post is smaller than the seat tube.