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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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@hippy
https://www.decathlon.co.uk/p/9-speed-rear-derailleur-alivio-m3100/_/R-p-X8628967
9-Speed Rear Derailleur Alivio M3100 £35
Would the newer style "shadow cage" 9-spd RDs work?