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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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hollow__legs
Interesting, 12sp chinese wireless electronic derailleur. Also compatible with 8-9-10-11..etc speed, van be changed in app - allegedly.
https://www.youtube.com/watch?v=4qNV0xiHeAo&ab_channel=BermPeakExpress