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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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DethBeard
Quite a few people have these
https://www.ebay.co.uk/itm/Adjustable-Height-Bike-Vario-Seat-Post-Kind-Shock-eTen-27-2mm-420mm-Long/201865036182?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649