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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.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@Vince
http://www.wiggle.co.uk/brand-x-13t-20t-fixed-gear-track-sprocket-18/
£5.69 on Wiggle
Not sure how cheap you want it to be...