Adjustable fit bicycle
 

He did say it weighed 53 kilos (116.8 pounds)!

So that'd be an extra 99 pounds of mass to help me get through all those pesky pedestrians and dog walkers stopped in the middle of the trail talking to each other! <grin>

Nice tidy work.

Crazy as it is, I'd find it interesting to actually feel how changing frame dimensions affect handling. Like "more rake" -yeah, I can read what it is supposed to do, but to actually feel the change while you're riding. hmmm. thanks for the post NG

I would think something along those lines, as a "fitting" bike that can actually be ridden, would be highly useful in finding the "right" sizing for a given person. It'd add the dimension of riding dynamics (weight shift, hills vs faster spinning, etc). If they can get the weight of such a thing down to be tolerably close to a "normal" bike's weight, it might be a great tool.

If all the geometry angles, lengths, heights, reach can be adjusted for a dynamic fit ...

But then, I'm no engineer. Perhaps even 10-15lbs over a "normal" bike would destroy any handling dynamics improvement over a typical stationary "fit" bike.

I suspect that sort of thing is where we'll be, at some point. Light enough to be a reasonable facsimile of a proper bike, but fully adjustable in all the geometry dimensions to get it right for a given person.