I actually kind of like the design in theory but am a bit skeptical of it in practice. This video of the hill climb seems like it raises a few questions like is that someone working on the street making those clunking noises and why didn't the rider make it all the way up?
Not much info on the actual motor and drive train and the area where it resides looks kind of slim to me for the amount of watts and advertised more torque than a Bosch? Time will tell and I wish them luck.
There was an early ebike effort that had an arch type frame called Pi Cycles that was similarly dependent on aluminum for it's strength but arched the other way.
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It didn't make more than a small ripple in the eBike continuum but I'd like to have one of the KR models to hang on the wall.....