Unsprung weight is an area of great focus among enthusiasts. The term collectively refers to the weights in a car not controlled by its spring, including the wheel, tire, brake system, and hub.

Weight is the enemy. In cars, saving weight means more speed, better handling, better ride, and increased efficiency, and while all automotive engineers will try and save a gram wherever they can ...

Luckily for those Cadillac V-Series Blackwing fans eager to swap on some ultra-light magnesium wheels, it sounds as though they're indeed still on the way.

Another interesting point is unsprung weight. In-wheel motors add lots of it, but Donut reckons the sheer amount of power and torque available essentially counterbalances the weight of the motor.