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Old 06-30-18, 02:57 PM
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Location: Chicago Suburbs
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Bikes: GT Transeo & a half dozen ebike conversions.

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Folding bike seat posts are longer than regular bikes. You probably need something that is 600mm (almost 24") long. The seat tubes in my Downtube folders (I was just measuring them today) are 30.3mm and over 22" long.

If I used an insert, I'd want one by the clamp and the other one with the lip removed so it can go down in the tube. I'd glue it to the bottom of the tube too. I am using an insert on one of my bikes, but the tube is only 8" long and only a few inches are above the frame. With a folder, you might have a foot or more above the frame and you don't want the bottom free to move.
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