[codersarepeople]

There are 2 schlumpf drives; there is a bottom bracket-compatible one like you describe. That is used for recumbent bikes and a few niche things like Kiwgglebikes. However, they still power the wheel with a chain. The unicycle hubs, which are the same as shown in the cyclauto, have no chain; the hub is also the center of all the spokes on the wheel. But yes, they are basically the same thing.

I'm sure it doesn't cost $1500 to produce, that's just the cost to consumers. My point wasn't that it's ridiculously expensive (which it is), but that this seems like a really high hurdle to produce the cyclauto; no other company is currently producing the unicycle version, and even if they can manufacture them for, say $500, that's still astronomical compared to if they used the cruzbike model.