How about dropping in to Bicycle magic? They are pretty helpful, if you're nice maybe take it off for free! http://www.bicyclemagic.com/ Greatorex st, opposite mosque.
@jogger started
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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How about dropping in to Bicycle magic?
They are pretty helpful, if you're nice maybe take it off for free!
http://www.bicyclemagic.com/
Greatorex st, opposite mosque.