I’m surprised Schwinn does not provide a longer seat post. I have asked also and
they didn’t have one.
Solution 1: File a notch across the bottom of the seat post (parallel to the
bolt holes) Put the seat post above the bolt (notch fits over bolt to prevent
turning) and tighten bolt. The friction keeps it from coming out. This will get
you an extra inch. (Schwinn will not recommend this method.)
Solution 2: Buy a 13" Schwinn post (or 18") from Tom Miller for $20 plus shipping. This will get you an extra 5 inches.
– Dirk Iwema Cincinnati, Ohio USA Internet: Dirk.Iwema@ae.ge.com