If you’ve ever watched a car commercial set in a laboratory, the tires of a motionless vehicle spinning on rollers, you’ve seen a chassis dynamometer in action. And with the completion in fall 2021 of a $2.9 million dynamometer facility at the Agricultural Engineering and Agronomy Farm just outside Ames, Iowa State’s will be one of the few publicly available chassis dynamometers in the world capable of testing large construction and farm machinery, including tractors and combines.