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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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@Sveinung
Most obvious sign would be a sticker, but the brakewalls of the ceramic rims look different (from the fact that they are coated (?) with some ceramic compound) -- never seen one other than on pictures, but see e.g. primitive robot's stunning wheelset (possibly still for sale) here.