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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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@ObiWomKenobi
only a few cm - ranges from 22mm to 31.8mm
http://i.ebayimg.com/t/Cyclo-Bike-Weldtite-Tools-Tool-Seat-Post-Measurement-Sizing-Gauge-New-/00/s/NDIwWDQyMA==/z/RKQAAOxydINSYAJh/$T2eC16Z,!yoFIfJf2877BSY!Jg4iRw~~60_35.JPG