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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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@Vince
http://www.chainreactioncycles.com/shimano-dura-ace-7600-track-sprocket/rp-prod106993
Dura-Ace track sprockets 15T and 16T only £7.99 and £8.99 so cheap!