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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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@TurtleRecall
I've just fitted one of the "5G" sets (52/36 too) to my new old Bob Jackson. Got that with the extra "2G" chainring, supposed to be equivalent to an Osymetric. I'll give it a go at some point once I get it built up.