Can't seem to find any relevant information.

But these bikes are fixed gear, so worth a shot here:
https://www.youtube.com/watch?v=NEdhc86i4Fc

Any idea what those gear ratios would be?

Most of the ones I've seen go for right around 1:1.

1:1

https://en.wikipedia.org/wiki/Artistic_cycling

Oh so it was called artistic cycling.
No wonder. Kept searching "circus bike acts"

Thanks I think I can do more research now and 1:1 gear ratios.... time to get uber small chainrings.
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One of the best artistic cycling videos I've seen.

Those Germans pretty much dominate!

Tried to find a nice big pic of a bike, but this is the best I could find,a pretty good shot of one of Ines Brunn's bikes. Upside-down steel road bars. Zero Rake fork. And I reckon that must be a unicycle saddle.

*mind blown*

this is a significant sport overseas. i have NO doubt that those bars and saddle (and everything else) are MADE for artistic cycling, not pulled out of some parts bin at their local co-op.

Here's another pic.These guys build 'em.

Yes it is.

You're probably right. The bars the woman in the white jersey is rolling are definitely AC-specific, there were never any road bars with that bend, and her saddle also, for sure. Those stems surely aren't going to be found on any old bikes. I still think Anna's saddle is a unicycle saddle and those bars totally look like they're off an old gaspipe 10-speed but I've been wrong before.

These are still possible ideas for a beginner-in-America's first AC bike build.

Those saddles are designed to be mounted on a beam type post for greater fore/aft adjustment,but i guess the biggest obstacle for a diy is the 0mm rake fork and steep HT angle for tight turning while tracking solid.