Adjustable wheels are the next big ( and small ) thing
Also adjustable length telescopic bars. :-)
Maybe a modern version of the Bionicon Edison?
https://www.pinkbike.com/news/Bionicon-Edison-Ltd-2008.html
like a horizontal dropper post?
@t_w started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
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Adjustable wheels are the next big ( and small ) thing