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  1. I would guess you have a loose bolt or a dry bearing race. A bike shop or co-op if you want to diy would be best to get it fixed. That seat is quite low for the size of the bike. You may have some fit issues or [fit the seat such that when your leg is extended that your heel is on the pedal and the seat is just under you](https://www.youtube.com/watch?v=UQDNTD2EeyU).

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