Maybe someone converted their bag using something like the thing linked to below
https://www.ebay.co.uk/itm/185805940673?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=sytx9udysbu&sssrc=2349624&ssuid=HmiiRX0WQo-&var=&widget_ver=artemis&media=COPY
@mrmotion started
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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Maybe someone converted their bag using something like the thing linked to below
https://www.ebay.co.uk/itm/185805940673?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=sytx9udysbu&sssrc=2349624&ssuid=HmiiRX0WQo-&var=&widget_ver=artemis&media=COPY