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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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tallsam
Slappingpythagoras
Eccentric rear hub, rotating it moves the axis about which the rear wheel spins, allowing for chain tensioning in vertical dropouts - it's a neat little bit of kit.
And no, I've got a nice magura hydraulic disc brake leftover from another project to go on the front. No rear brake because fixed