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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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@O'Shane
Google brings up a lot of helpful looking stuff. As you know more info about the frame in question you should be able to make the search easier - https://www.google.com/search?client=ubuntu&channel=fs&q=531+seatpost+sizes&ie=utf-8&oe=utf-8&gl=uk