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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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@freezing77
Best guess, bike saddle rail clamp
or seat rail clamp
https://www.google.com/search?q=bike+seat+rail+clamp&safe=off&client=firefox-a&hs=Ag3&rls=org.mozilla:en-GB:official&channel=sb&biw=1366&bih=644&source=lnms&tbm=isch&sa=X&ei=-bt5VK2LJ9PQ7AaT6IGIAQ&ved=0CAcQ_AUoAg