Looking at the tire and what I can see from the vehicle design in the second video, the technique appears to be adopted for a high efficiency bike or miniature 3 wheel car, like a solar powered vehicle for competition. I can assume they went through the trouble for a performance increase in efficiency. However, we are not told if they have achieved any overall performance gains.
I wonder if the reverse can be applied for a generator, where, at times I may have a fast but low torque mechanical source, and, for the same device, I will at other times have a slow, but, high torque source. I would like to keep the generator in it's sweet spot of 92-96% efficiency without resorting to a mechanical gear box where I loose efficiency due to additional friction.
The question is; is it worth my R&D efforts to build such a generator?
My generator is also a pancake generator due to available space, so, this can get costly...