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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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@Ced
http://cgi.ebay.co.uk/Campagnolo-Super-Light-Track-Cog-14T-/250643061171?cmd=ViewItem&pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item3a5b7d99b3
14t though.
I've got the 15 tooth version and it is incredibly light.