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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.
amey
http://www.drivetraincalculator.com/drivetrain.php?ST=S4&FD=S4&RD=S4&CN=S4&CS=S4&CR=S2