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Behold The Hyundai Uni Wheel. Transportation May Never Be The Same
(cleantechnica.com)
This is a most excellent place for technology news and articles.
A U-joint has worse modulation between input and output than a CV joint. However, I did look again at the video as big as I could and you are right, the motors are pivoting. It seems to only pivot a partial amount and still at an angle to the wheel. Something is still being glossed over.