• What really spins me out. Is the lack of disc mounts for disc brake.
    Why else would you need both fixed and free to be on the same side of the hub?

    Because why engineer an internal freewheel mechanism and then screw a fixed sprocket on the other side, you still have to take your wheel out. That involves using a tool!!!..

    where as turning a screw in the hub only involves turning a screw with a tool...

    hmmm.

    Seriously though, in theory if there was a handle bar mounted lever that changed between the two it would be genius, i mean what's the problem with running a back rim brake (unless you have wooden rims)?

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