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Two words - hub motors.
Reduce the weight by 75% over current approaches means less unsprung weight. That would be meaningful.
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Someone commented that. Isn't unsprung weight weight that is not "sprung" by the suspension? AKA wheels/axles? Wouldn't that make hub motors create more unsprung weight.
For the DIY electric cars, this motor isn't all that special. We need lighter/cheaper batteries.