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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.
@BareNecessities
^ Don't know if these have been mentioned, but I've found them both useful.
Magic gear calculator.
http://www.eehouse.org/fixin/formfmu.php
Other useful stuff.
http://software.bareknucklebrigade.com/rabbit.applet.html