Sometimes the vibrations go the other way and the seatpost needs to be stronger to take it.
https://www.youtube.com/watch?v=c9u6wnyqL30
Er, WTF did I just watch.
Nice to see that particular tradition being kept alive ;)
@JWestland started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Sometimes the vibrations go the other way and the seatpost needs to be stronger to take it.
https://www.youtube.com/watch?v=c9u6wnyqL30