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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.ebay.co.uk/itm/Fixed-cog-17t-sprocket-plus-lock-ring-fixie-fixed-gear-single-speed-/281276527472?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item417d633370
17T sprocket + lockring = £4 including postage.
Doesn't get any cheaper than that...