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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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@se1derful
One of these hooked up to a 12V batt for the Olympics maybe?
http://www.thetoolboxshop.com/0-642-24-24v-490hz-high-tone-2-pole-marine-trumpet-electric-horn-2381-p.asp