Also adjustable length telescopic bars. :-)
Maybe a modern version of the Bionicon Edison?
https://www.pinkbike.com/news/Bionicon-Edison-Ltd-2008.html
Needs Fox Live Valve, AXS, 27 flip chips, and a 29er fork. And only then will I consider it complicated enough.
That was a pretty cool concept actually. No idea what it was like to ride.
@BareNecessities started
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Also adjustable length telescopic bars. :-)